Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fb47c532b946ea…

MALICIOUS

PDF

33.8 KB Created: 2021-06-28 22:37:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1bb20954f2cfdafa1aacee4b30d807f7 SHA-1: a0c1e02fc16f7aec9b016f08b97ede71bc69b4f8 SHA-256: e9fb47c532b946ea9520cd3dfe3a7479bfc8ead85c395aa20ad9bd3ee21d534e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites promising free in-game currency and accounts, indicative of a scam or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the document body and heuristics suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-robux-website-without-human-verification-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-accounts-with-obc-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-cheats-for-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/when-does-roblox-librity-county-come-out-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-roblox-using-command-prompt_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roxploits-roblox-exploits-and-hacks_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/more-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-hack-app_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-free-online-unblocked_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/worst-client_GM479516143.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_off00002fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB6 21008 bytes
SHA-256: a6aea08638a3208f72f5947d5c13c7b4bd478a0d4f66f3a4da1e0471b7fd8739
font_01_sfnt_off00005d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D16 19700 bytes
SHA-256: 7216a7a5914f0e522931574dd0169ec6d7d97ce76ca7e4125118d3e5e57538de

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