I doubt that it would be possible to make that stunt.
Even if you could manage to send with enough power and without someone take any notice from it, the moon still is an awful reflector.
Its not flat. Its a very bumpy sphere.
The signal would be spread all around, with only a very little usable signal coming back at you.
This "signal" would come from any surface point of the moon and would underlie a constant changing signal strength because of signal amplifications, when signals overlap in a positive way and signal erasement when they overlap in a negative way. This dependent of where you are and where you point your antenna.

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"Who does not know anything, must believe everything."
Baroness Marie von Ebner-Eschenbach 1830-1916