Um, you do know faucets give coins away for free right? So how could this be a scam? There are any number of reasons the faucet may not pay you, but this does not fit into the scam category. You are out nothing if the faucet does not pay, so you cannot be scammed.
they have malicious banner inside them, i think this is what OP is talking about
https://bitcointalk.org/index.php?topic=1044399.0thank's for your link reference, now iknow some faucet is have hidden malicious banner