Malicious PDF — malware analysis report

Static analysis result for SHA-256 93547ada36ad762f…

MALICIOUS

PDF

38.3 KB Created: 2021-05-12 19:01:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 994c3f5157784f77fcfa5822c4785239 SHA-1: 4ee690a2a77cb9100d5999658a70e2c933529ef7 SHA-256: 93547ada36ad762f0cd3da1ed9466033d3a2d3902ccea2c16ebb560097415fa3
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a "Coin Master Gold Cards Free Game Hack" lure. This link, https://netcdn.xyz/app/406889139/coin-master-gold-cards-free-game-hack, is identified as malicious infrastructure. The document body also contains text and a button encouraging the user to click the link, reinforcing the social engineering aspect of the attack. While no scripts were explicitly extracted, the nature of the redirector suggests it likely leads to a further stage of malicious activity, such as malware download or phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0126

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/coin-master-gold-cards-free-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000345b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x345B 24004 bytes
SHA-256: 0db754d8f84818d9b72f2c02bd2ad31a630d2d251db9791629b29fa9203a6145
font_01_sfnt_off00006aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AED 2944 bytes
SHA-256: e8dca988325d5b5adea380508eed68725fcb814536e93cd420f224b7166adc23
font_02_sfnt_off00007518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7518 17960 bytes
SHA-256: 5f0d383e38c54a4b706fba9e56337a6488be6196f7a5d6bfa1241f48271576e4

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