Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0f1b632e65186a…

MALICIOUS

PDF

37.8 KB Created: 2021-06-20 23:29:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 50535310547780da361cd74ba4c6bfe0 SHA-1: ec227ebbfaeba4cb43f7a0f654e81c9de9659d97 SHA-256: cb0f1b632e65186a2a7be5ca58242d028c7ca3f0ed0aa0a69ae8bfa4aeb8771f
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 0.9985

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/where-to-get-free-robux-game-hack PDF link annotation
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/how-to-hack-any-account-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/pubg-uc-zong_GM1330123889.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/free-robux-now_GM431946152.pdfIn PDF document text
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/boku-no-roblox-infinite-spin-hack_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_off00003caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3CAA 22436 bytes
SHA-256: 91b9fe20f4e8bc1e61bedf6ab08720fc120050129c86b0ea930fcc2b7fc4a0e9
font_01_sfnt_off00006eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECA 19184 bytes
SHA-256: e942b93b228ea09a2b9b89b185e62feaf889c583a2152a741a620a9da1dbb754

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