Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8f948d6e1f5d53…

MALICIOUS

PDF

33.8 KB Created: 2021-06-17 17:01:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 947ab715e7888843023d19cda8ad0fdd SHA-1: 3645f17e7c1cfc29166f18f5ad57e915dee1b612 SHA-256: 7e8f948d6e1f5d53f45d1137e182101e3f07d863be45bd538f01d6bdb9b15fa3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a primary link identified as a malicious redirector. This redirector is associated with lures for game hacks and generators, suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-obc-roblox-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/pubg-uc-avatar_GM1330123889.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-without-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/www-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/is-it-illegal-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/tiktok-free-likes-and-followers-2021_GM835599320.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-online-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-the-sex-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-spiderman-mask-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-2021-comxa-dot-com_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn 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
font_00_sfnt_off00002e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E5C 22360 bytes
SHA-256: dc920993e4667f392bcf590eebede49031011f791469d1e5a54117c177463eb2
font_01_sfnt_off00006030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6030 18652 bytes
SHA-256: 1348d6f6ae832d96f1a82e2137bcaff65c2b0e3004013827095df8b36a295d4b

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