packer

To get the file: wget https://artifacts.picoctf.net/c_titan/22/out

By looking at the strings with strings out it can be seen that it was compressed with upx. It could be decompressed with upx -d out. By looking at the hint you could use strip to reduce the size of a binary strip out.

By putting it in Ghidra and analyzing the program the entry function would be a good place to start. There is a parameter to the entry function, FUN_00401d65, and when double-clicking it in Ghidra it moves to that function. When scrolling down to see the contents of the function many prompts can be seen with one of them being this:

"Password correct, please see flag: 7069636f4354467b5539585f556e5034636b314e365f42316e34526933535f35646565343434317d"

By putting the Base64 text in CyberChef the flag is given.

Flag: picoCTF{U9X_UnP4ck1N6_B1n4Ri3S_5de...}