Malicious PDF — malware analysis report

Static analysis result for SHA-256 d285dd85dfe1c86b…

MALICIOUS

PDF

36.0 KB Created: 2021-05-16 01:35:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b374406e646568e4f18c9b1b3765ac2d SHA-1: 9c771c737bcdf59ab075ea7e2c38ef0338f04415 SHA-256: d285dd85dfe1c86b81d23dd2a1601e69fe4f2dfc0c2494d631f6687cebb2a4ec
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a 'free generator' for Coin Master, directing users to a URL associated with malicious redirector infrastructure. The document body, though partially corrupted, contains the same lure and URL. The presence of embedded URLs and the critical heuristic firings strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0228

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://netcdn.xyz/app/406889139/free-coins-and-spins-for-coin-master-game-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000341f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x341F 24240 bytes
SHA-256: 01a1fb3bab3c87f55eae3cecbc9e1e6feef3e5a2fe15a6cf55f6b999ae1c1c38
font_01_sfnt_off00006b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5B 18320 bytes
SHA-256: 2c95db8d02702652075be8f6568e083e0c31fb28563b2fbbcaccc1dd0c48c672

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