Santa received very few messages. And now is asking himself are kids still outhere?
The ZIP file is attached, but when you actually try to open it, you will see that it's just a plain text file. Rename it to .txt file, open in some viewer (for example, web browser), decrease the font size to the minimum, and see this:
Use the QR reader on your mobile phone to get the flag:
ctf{D3cktheHa11s}