Affine Cipher. Find magic bytes of a pdf to find the values used to encrypt the original pdf. Full writeup [here](https://github.com/jontay999/CTF-writeups/tree/master/HackTheBox/CyberSanta/Crypto/xmas_spirit)

Original writeup (https://github.com/jontay999/CTF-writeups/tree/master/HackTheBox/CyberSanta/Crypto/xmas_spirit).