> Is there any way to just dump linux binaries in some
> directory and call httrack from a perl script, just
> as httrack.exe under Windows?
Linux binaries, compiled for the same platform (intel-32, amd-64..) maybe -
but ensure that the dependencies (the C library, especially) fit together.

The best way is to try, and see if it works. But I suspect that your ISP won't
allow you to execute files either..