There are tracing programs that let you see when a program makes system calls to read and write files, control hardware, etc. It might be easiest to run it and see what it does in a VM sandbox. Process Monitor looks like a strace equivalent on windows.
I wonder how many sites will bother checking for Spanish pornpasses. Seems they’re just playing people and waiting for the inevitable, “Turns out the Internet isn’t respecting our kids, we need to ratchet up the control. We tried to give you a good deal though, right?”