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Luther did translate the bible to what is known as the Luther Bible from old Greek, old Hebrew and Aramaic sources - not the latin translations that were widely used with the catholic church in Germany.
Here are the two hints from the wikipedia article:
He used Erasmus' second edition (1519) of the Greek New Testament, known as the Textus Receptus.
[...] by 1534 he completed his translation of the old and new testaments from Hebrew and Greek into the vernacular [...]
Luther was more familiar with Hebrew Greek than with Greek Hebrew which is why his translations received help by others - especially Philipp Melanchthon.
Luther must have known at least German, Latin, Greek, Hebrew and Aramaic.