Huntress-CTF - DontBelieveEverythingOnTheInternet

Fri, 01 Nov 2024 00:00:00 +0000

Don't believe everything you see on the Internet! 
 
Anyway, have you heard this intro soundtrack from Half-Life 3?

The challenge starts by downloading an .mp3 file. While trying to process it in Python to extract metadata, I encountered errors. After several attempts, I started to wonder if it was actually an MP3 file—or something else. I wrote a function to determine the real file type:

import filetype

def check_file_type(filename): 
 kind = filetype.guess(filename) 
 if kind is None: 
 return "unknown file type." 
 return f"type: {kind.mime}, extension: {kind.extension}"

filename = 'src/Half-Life_3_OST.mp3' 
print(check_file_type(filename))

Thanks to this script, I found out that the file was actually a PNG:

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Huntress-CTF - DontBelieveEverythingOnTheInternet