DUBAI, United Arab Emirates — The operator of Dubai’s largest mall said Monday it made an $880 million offer to purchase the Middle East’s biggest online retailer Souq.com, adding new corporate intrigue to the website’s rumored sale to Amazon. Emaar Mall’s bid for the site comes after Emaar chairman Mohamed Alabbar reportedly met in November with Amazon CEO Jeff Bezos at the state-backed firm’s cavernous Dubai Mall, home to a massive aquarium and in the shadow of the Burj Khalifa, the world’s tallest building it built. In the time since, Amazon apparently went after Souq.com as Alabbar stands ready to launch his own online retailer with Saudi money called noon.com.