Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9f9986da8fe4f9…

MALICIOUS

PDF

34.1 KB Created: 2021-06-23 02:07:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e7d76e52a758d28b9443a13b057db87b SHA-1: f2c15b97f3d2fa12625c1d632e3cfdb581690164 SHA-256: df9f9986da8fe4f9e8c9650b303318710ff7b4b092f6c50b1350654e59e2c61c
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/roblox-free-robux-codes-game-hack PDF link annotation
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/wurst-115_GM479516143.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/robux-gratis_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_off00002f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3C 22036 bytes
SHA-256: d418fe7d308ab000116b2ce646b776fecd8a4b245b4e4da9892f87d63b8d9268
font_01_sfnt_off0000604b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x604B 18964 bytes
SHA-256: a55805342354896b15de53c372ce6b4f67675692ecef428388acdddaf3dfd905

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