Decrypt Unknown Binary File Challenge

I have a binary file hosted here: https://www.naver.com/ that is completely unreadable to me. The algorithm behind the encryption is still a mystery—no visible headers, no magic numbers, and I have zero side-channel clues or key fragments to share... (Budget: $250 - $750 USD, Jobs: Algorithm, C Programming, C++ Programming, Cryptography, Data Analysis, OpenSSL, Python, Reverse Engineering)