Scammers are abusing the Notifications and Push APIs and Google Chrome on Android devices to push spam alerts customized to look like a missed phone call. The two APIs are used on mobile devices for push notifications – short alerts designed to re-engage the user. The messages can be triggered by a local application or a server, regardless if the app is running or not. When Chrome’s icon is changed, there is little to hint at the forged nature of the message. The only giveaways would be Chrome’s name, the app that triggers the notification, and the domain pushing the spam.
Source: https://www.bleepingcomputer.com/news/security/android-users-being-spammed-using-fake-missed-call-alerts/