Malicious PDF — malware analysis report

Static analysis result for SHA-256 842b8e94fe7ed805…

MALICIOUS

PDF

35.1 KB Created: 2021-05-18 05:00:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7e013bb4705840c526941ae41a9e5b5a SHA-1: 06a932aaf892e78dc262d841f24678da13b85c6d SHA-256: 842b8e94fe7ed805772d60d1e2e512ad951e96ea402a0c37ebc0f65f44624b4a
190 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link that leads to a "free generator / game hack" lure. The document body explicitly contains a call to action to "CLICK HERE TO ACCESS COIN MASTER GENERATOR" and a URL associated with this lure. Furthermore, a critical heuristic indicates the document requests recovery secrets or private keys, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

Heuristics 5

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/master-coin-free-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_off000032e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32E2 24132 bytes
SHA-256: 7b7419dde3056148ecfa0a3d2dc4804260f51707af7a1039888eeee90ccdec82
font_01_sfnt_off000069ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69AE 17712 bytes
SHA-256: 91e2622ab411f5265f7b42a83c7ab878b3bc5f44429a3c49d98d87fe55e59feb

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