Sofia Santos

@gralhix
283 Followers
13 Following
160 Posts

🇵🇹 Senior OSINT Investigator & Tech Lead
~ Addicted to finding stuff and explaining things ~ Occasionally funny ~ https://gralhix.com & http://youtube.com/@gralhix

Smart opinions definitely my own. The other ones will be blamed on sleep deprivation.

OSINT Tutorials & Exerciseshttps://www.gralhix.com
YouTube Channelhttps://www.youtube.com/@gralhix
Sofia SantosDec 31

Do you want to investigate possible human rights violations happening right now, in plain sight?

Protests in Iran are spreading across major cities & authorities are escalating efforts to suppress them.

In 2022, I published a practical guide on monitoring oppressive regimes using Iran as a case study. These methods & guidelines remain relevant & applicable across platforms.

If you are looking for a way to jump from theory to practice, this is a good place to start.

https://gralhix.com/2022/12/17/how-to-monitor-oppressive-regimes-on-twitter-using-tweetdeck/

Sofia SantosDec 14

For my 2nd challenge for @OSINT4FUN's Advent of OSINT 2025 you will need to identify the airline, make and model of the aircraft seen in the photo below.

Can you do it? 🤔

Enter your answer on OSINT4Fun's page to confirm whether you were right 🎅

Best of luck!

https://www.osint4fun.eu/advent2025/20251214023000

Sofia SantosDec 5

The answer to this OSINT challenge will reveal my favourite Christmas film of all time 😍

For one of my @OSINT4FUN's Advent calendar tasks, I wanted to add a twist. Instead of starting with an image or video, you begin with the coordinates. The problem is that these point to.. nothing..? 🤔

Enjoy and please, NO SPOILERS in the comments!

https://www.osint4fun.eu/advent2025/20251204163000

Sofia SantosDec 5
BellingcatDec 4
Know how to make online communities feel like home (and stay organised doing it)? Bellingcat needs a Community Operations and Project Manager to support our growing global Volunteer Community and to help run Bellingcat’s Investigative Toolkit project.
Apply here: https://www.bellingcat.com/bellingcat-jobs-careers-community-operations-project-manager/
Community Operations & Project Manager  - bellingcat

We are looking for a Community Operations & Project Manager to support our growing Volunteer Community and Bellingcat’s Investigative Toolkit project.

bellingcat
Show threadSofia SantosNov 30

6/6

Check out all the details of the top 2025 OSINT and CTF Advent calendar challenges which are sure to keep you busy this December:

https://gralhix.com/2025/11/30/top-2025-osint-and-ctf-advent-calendar-challenges-to-keep-you-busy-this-december/

I wish you all a great end of the year 🌟

Show threadSofia SantosNov 30

5/6
And finally, TryHackMe returns once again with Advent of Cyber 2025.
There will be multiple ways to test your cybersecurity skills with these beginner friendly challenges. With prizes worth over $150,000 are you sure you want to miss it?

🖥️ Find them on: https://tryhackme.com/adventofcyber25

Show threadSofia SantosNov 30

4/6
The HEX ADVENT 2025 is a Christmas themed CTF fully designed by women!
Members of the Singapore’s female cybersecurity community and female co-workers from STAR Labs created these challenges available to everyone! If you are eligible you may even win prizes.

🤶 Check it out on: https://hex-advent.starlabs.sg/

Show threadSofia SantosNov 30

3/6
I also heard from a good source that the @Bellingcat 's open source December challenges won't be business as usual. My suggestion is to keep your eyes peeled and perhaps check out their Discord server or newsletter for tips and updates. I do love a good mystery.

🗓️ Check them out on: https://challenge.bellingcat.com/

Show threadSofia SantosNov 30

2/6
First on my list is @OSINT4FUN 's Advent of OSINT 2025.
This project is not new to the game having already (successfully) created two previous editions of OSINT Advent calendars. This year they’re back for more!

🎄 Check them out on: https://www.osint4fun.eu/advent2025

Sofia SantosNov 30

1/6
It’s that time of the year again. As we wrap up 2025, I have compiled a list of the best OSINT and CTF Advent calendar challenges that are sure to put your skills to the test this season! 🌟

Are you ready for a busy December? 👇

https://gralhix.com/2025/11/30/top-2025-osint-and-ctf-advent-calendar-challenges-to-keep-you-busy-this-december/