Huntress-CTF - DontBelieveEverythingOnTheInternet

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:

Type: image/png, Extension: png

I then processed the image using the PIL library with this code:

from PIL import Image  

image_path = 'src/Half-Life_3_OST.mp3'  
img = Image.open(image_path)  
img.show()

This revealed the flag:

flag{a85466991f0a8dc3d9837a5c32fa0c91}