Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8aef7d1d9647452…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 09:23:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5cce3e5cbe259e5e2565c9894b67ef4b SHA-1: d0ad56c7d55a9072f6409e182eefc32dfa0a1020 SHA-256: d8aef7d1d96474523cf029765e7ed15e564ce1c806fd76b4d4f0b27d4b4160a2
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 0.9864

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 https://netcdn.online/app/406889139/free-download-coin-master-game-hack PDF link annotation
    • http://lib-smansumsel.sch.id/repository/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-edition_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-download-mac_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
stream_004_off0000520f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520F 29756 bytes
SHA-256: d1fdc2d510b9fc1e37e60489790c40d0f33163a4c14494d2191efd4d3b709668
font_01_sfnt_off00008fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB8 18292 bytes
SHA-256: f7e7ab01f272ced417b1f6f65c7a93c96b51da51ceb989c470a75dce226d63c1

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