It's not possible , you need access to private keys in order to gain access to the bitcoins . If by the seed , you are talking about the random generated ones by wallets like Electrum and Multibit HD then unless the hacker have at least a small idea about the passphrase , It's impossible for him to brute force it.
Actually, I want to know how to attack the bitcoin address.
Get an address with a high amount of bitcoin in it. How can a hacker attack this address? There is no other information. There's only address information and bitcoin amount.