According to an unconfirmed report, the redirection of Bradesco was the result of what s known as a cache poisoning attack on Brazilian internet service provider NET Virtua. According to this Google translation of an article penned in Portuguese, the attack was on Net Virtua, according to the Google translation. Read the full story here: http://www.dailymailonline.co.uk/news/newsonline/article-article-news-news/originally-report-false-scrambled-false.
Source: https://threatpost.com/cache-poisoning-attack-snares-top-brazilian-bank-042209/72576/