Malicious PDF — malware analysis report

Static analysis result for SHA-256 22934841e7cf9d4e…

MALICIOUS

PDF

34.1 KB Created: 2021-06-30 01:44:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 32bdb54c951b8f34ee3d59bc59aca920 SHA-1: e5db351320d52ab6e0e0e132672ba6ef32b042d0 SHA-256: 22934841e7cf9d4ef863f136c2be8613c40e322fcc703c0cd5ce3a58fe73efb3
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.co/app/431946152/free-robux-codes-not-used-2021-game-hack PDF link annotation
    • http://perpus.masda.ac.id//repository/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/tiktok-free-3d_GM835599320.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/working-free-robux-obbys_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-giver-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/pyudry-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-4l-tiktok_GM835599320.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/wwwroblox-hacks-for-robux-easy_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-hack-get-unlimited-free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-robux-without-doing-a-survey_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-hack-in-mm2-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-spins-and-coins-daily_GM406889139.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_off00002d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D71 22148 bytes
SHA-256: cf3ae476572a93db825382bc374a4c5baf9dbefa6fa320c2fb54f468ba1115d3
font_01_sfnt_off00005ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC0 19396 bytes
SHA-256: 6b7c564edebe12453394606297ee7aa7ab9ab6419eb130275a88888a299dc27a

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