Was The first known attack that showed a link to bin Laden and his associates was a 1993 explosion in a hotel in Aden Yemen?

No, the first known attack linked to Osama bin Laden and his associates was the 1993 bombing of the World Trade Center in New York City, which occurred in February of that year. The 1993 explosion in a hotel in Aden, Yemen, targeted U.S. military personnel and was also attributed to bin Laden's network, but it came later, in December 1992. These attacks marked the early stages of bin Laden's campaign against U.S. interests.