No, Binance itself wasn't hacked. Users lost funds due to a phishing attack.
It appears that the hackers used login credentials obtained earlier by luring users onto a fake version of the Binance site (see example below). Then, on Wednesday, they used hacked users' accounts to drive up the price of a relatively illiquid coin called Viacoin (ticker: VIA) and syphoned the gains into a number of accounts under their control.
Source: https://mashable.com/2018/03/08/binance-phishing-attack/#eoJo00X_MiqS
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