Malicious PDF — malware analysis report

Static analysis result for SHA-256 662a341b7aa9788e…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 05:01:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f1eabc64078a9b18bcc73db95a2794b1 SHA-1: bd6f4f9f2d3d7686863879f5446674cf30704591 SHA-256: 662a341b7aa9788ec5fb884eba53ea6f3ccc4e29bb1bab52d71826e65dfeaa11
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-free-coins-spins-game-hack PDF link annotation
    • http://library.stieyapan.ac.id//repository/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-tiktok-jelly-fruit_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hacks-for-sailing-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/auto-clicker-for-mac-roblox-free-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/promo-codes-for-free-robux_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
stream_002_off00003049.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3049 23024 bytes
SHA-256: 79e5b7140b3f72543fe4d85ebe0416268bb7f065fb7b2aaa0050b8ef165d7b72
font_01_sfnt_off00006438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6438 18176 bytes
SHA-256: c90cd52c690b3b1dd04b69356ad4f8db221968fb130a3d2ff71dcd50323a1a90

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