Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a17d0d0879210f…

MALICIOUS

PDF

35.5 KB Created: 2021-06-19 23:24:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8eeccd9b98dee94834b4d1158241fb1c SHA-1: cdc382583643337b1c41c3f4e5779d86983ebe5b SHA-256: a6a17d0d0879210f4dfadaffb0cc4793343b6d3311260be4f11051fa57cfffe3
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/406889139/coin-master-hacks-for-gold-cards-game-hack PDF link annotation
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/oprewards-points-generator_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_off0000357a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x357A 22600 bytes
SHA-256: 1a1903149b20d07baaf3f84c8e40aed57770903763a339a1132ff383df3cb44e
font_01_sfnt_off000067e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E4 18416 bytes
SHA-256: 05bbfd58fa93bc695b21bb0c6c5cb13131497fa0aadcf4bf103cc410958f4448

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