Malicious PDF — malware analysis report

Heuristics 5

• Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
  PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
• Image-heavy PDF hides clickable URL with PDF string escapes high PDF_ESCAPED_URI_IMAGE_LURE
  PDF is image-heavy with little real text and its clickable HTTP(S) URI is encoded with PDF octal escapes. This combination is common in credential-phishing PDFs that render a screenshot-like prompt and obscure the destination from simple URL extractors.
• Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
  PDF has 2 image(s), only 0 text block(s), carries a click-outward action, and is only 43 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
• Fake invoice / payment lure low SE_INVOICE_LURE
  Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
• Embedded URL info EMBEDDED_URL
  One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
  URL https://login.microsoftonline.com/common/oauth2/v2.0/authorize?scope=openid&prompt=none&client_id=dff569e2-a4b0-4b27-b0ea-5385fb913357&state=bryan@guidepointsystems.com In PDF document text

  • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

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