Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3b418ebba526db…

MALICIOUS

PDF

64.0 KB Created: 2021-07-04 11:32:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: afad8c085d4047856fd430a09c160fbc SHA-1: 6de66efc87584a5143f29542fa330475af4712b4 SHA-256: 0b3b418ebba526db97606e1b8f8b6b546f4e4b55907592aeafedab1114aa9dee
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links pointing to a known malicious redirector. The lure text suggests a social engineering tactic to trick users into visiting the malicious URL, likely to download a secondary payload or redirect to a phishing site. The PDF_GAME_HACK_REDIRECT_LURE heuristic confirms the nature of the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0438

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://netcdn.tw/app/1094591345/pokemon-go-free-candy-hack-game-hack In PDF document text

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