This challenge is under the Misc category.
My friend pranked me and hide my secret in one these!
A file named tedious.zip is attached. You can download it here.
Extracting the contents of tedious.zip, we get a file called tedious. This is another zip file that contains a QR directory. Within the QR directory is 4255 other files.
By sorting the files by size, we can find the odd one out:
Extracting it, we realise that it is a png file containing a QR code. By scanning
the QR code, we get the flag: