Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c6e87ab09cf1cf…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 02:10:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c7559a414e4852b32c12711b068221e9 SHA-1: e1edfdf4e90bacdbe23abfcac52477ca1243ab30 SHA-256: f5c6e87ab09cf1cf2468cfed676aeaa458979e62ed6520db242fc330a17fc9dc
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/431946152/roblox-zamasu-dbn-prealpha-hack-game-hack PDF link annotation
    • http://library-fkip.uho.ac.id/repository/farming-simulator-free-codes-roblox_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/hack-robux-infinitos_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-bubble-gum-sim-hack_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-money-generator-free-download_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/my-roblox-account-got-hacked_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-cheat-engine-66_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/cch-ly-robux-free-minhmama_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/hack-aimbot-para-roblox_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/robloxain-roblox-hacks-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
font_00_sfnt_off00003052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3052 22116 bytes
SHA-256: 2adc0fc8e24668cc4087f8ff00a318c7b6455aca826f5e0ed27b78ff467059a3
font_01_sfnt_off00006182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6182 19628 bytes
SHA-256: baed22666d95d5e871c91cc3280bde69afbc0db71ba29aa9bee2a22c8c35e37a

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