The Anonymous collective continues the wave of cyber attacks against the Expo 2015 Universal Exposition. The last victim in order of time is the Best Union, a company that manages the online service for the sale of the tickets. The attacks started on April 30, the day before the opening ceremony with a series of DDoS that hit the official website for the ticket sale of tickets (https://tickets.expo2015.org) The cyber attacks went on intermittently for about two days. The hacktivists are targeting Expo 2015 to protest against the alleged corruption that has influenced the procurement of the works planned for the event.”]
Source: https://securityaffairs.co/wordpress/36907/cyber-crime/expo-2015-anonymous-attacks.html