http://stackoverflow.com/questions/4776593/how-to-class-dump-ipad-apps
The issue here is that the binary you obtained has been signed and encrypted to be used on the App Store. In order to class dump or disassemble it you will need to obtain an unencrypted binary. The easiest way to get this is to use GDB to dump the executable when it's running (since the iPhone decrypts the binary to run it).
Of course, this will require a jailbroken device.
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