Malicious PDF — malware analysis report

Static analysis result for SHA-256 1210b22f31efbac9…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 16:58:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1e95e312bcb45cad47174da0e4edcc1d SHA-1: cf0825afe112758e57e968c4e9472e2dcda6a758 SHA-256: 1210b22f31efbac9fb87b66bc05245ba99b0581f8a2f05d7560f5150b4d3faaf
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.tw/app/406889139/coin-master-hack-apk-with-fb-login-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/free-roblox-card-reedemm-code_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-roblox-using-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-roblox-surf_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-abilities-for-twisted-murderer-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-for-kids-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-gift-card-roblox-giveaway-live-youtube_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-online-photoshop-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-by-roblox-astebin_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-5-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-free-items-google_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pubg-uc-no-verification_GM1330123889.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-grayphiny_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_off00003247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3247 22464 bytes
SHA-256: 4495f4888b23a91aed237e98820766d07a519472d7dafd091dee9caa5bfd0f4d
font_01_sfnt_off0000641e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641E 18868 bytes
SHA-256: 64625659131879135842d7eca704acc58928c97793d04a50d93f3f4b5b29fb0a

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