Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50af0f97405ac4a…

MALICIOUS

PDF

34.2 KB Created: 2021-06-20 01:29:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d932098767b38a49f4849d3aa676fff4 SHA-1: 7bd79ed45b3f4f3b761b9481d201e07f7353a618 SHA-256: e50af0f97405ac4a41e38068fd54bd95d80407407a03b9522d2bbf0e250a7c57
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/479516143/hack-minecraft-game-hack PDF link annotation
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-money_GM431946152.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-images_GM431946152.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-coins-twitter_GM406889139.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_off00003440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3440 21784 bytes
SHA-256: ba8ed27903c8a93d7b3d0baec8e51d287e820dd7f5d18a3dbc90fd6f524207df
font_01_sfnt_off000063da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DA 18024 bytes
SHA-256: dfd9b79a19cc1f195c001309102fb5aa6a063071b6395cd5a2b473f5f084aedf

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