Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcafd397c45468e7…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 05:56:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0d36b91a3b646743a06bb602879460e0 SHA-1: 5ca809fe40af239b69f7b5502c011bc29695b2f8 SHA-256: fcafd397c45468e7ba483da90496ac966bbcf959f37b7534f5ad1bdca65805f5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a game hack lure to direct users to external URLs, including http://netcdn.tw/app/406889139/www-coin-master-hack-xyz-game-hack. The PDF also contains a large number of links to other PDFs on c2o-library.net, indicating a link farm or SEO manipulation strategy. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection and link farm behavior.

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/406889139/www-coin-master-hack-xyz-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/roblox-free-online-unblocked_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/a-modded-day-hack-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/robux-how-to-get-without-glitch-or-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-know-if-your-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-in-an-lg-phone_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/invisibleble-hack-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-hair-roblox-not-a-model_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-can-you-hack-roblox-tattletail_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-how-to-get-free-gear-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/fly-hack-roblox-jailbreak-download_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-no-verification-at-all_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_off00003099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3099 23040 bytes
SHA-256: 53eb3ded3ab217ac14331efd54b39d7374bd1b72e430ce74f6a6eebcd276f10d
font_01_sfnt_off00006447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6447 18856 bytes
SHA-256: 2dd980c1404d819d66b642276e6e99250224d656c5ab39802198873ce914a4ba

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