Malicious PDF — malware analysis report

Static analysis result for SHA-256 b854ea6a9680dfe6…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 14:52:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6d4746d39158173a471f8c0fe98842af SHA-1: bc10d314e54272a9ff5eca1fbfd5bc8acb82df5d SHA-256: b854ea6a9680dfe6d305b0ebe619603be2aa036b1cbcbadcbb501c282fa28508
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-ios-cydia-game-hack PDF link annotation
    • https://lib.unitri.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-creepy-april-foools-hack-face_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/cheat-for-i-dont-feel-so-good-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/claim-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/slurp-roblox-hack-discord-server_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-tik-tok-quiz_GM835599320.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_off00003515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3515 22648 bytes
SHA-256: 485b48d36bd7a98903a74640f1ccf6382553b651c3852ca40d947ec0959266cd
font_01_sfnt_off000067dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67DC 18356 bytes
SHA-256: c09b0b28df115d3bd359a7912cd1a4c3792fd5da5b0a9bc4eed149ec2eaef80b

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