Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef969e44b370cb8…

MALICIOUS

PDF

33.6 KB Created: 2021-06-20 01:03:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 38432228baac28f7aa03d61bd3ba80f4 SHA-1: 4464e7a0ac25b7d0e3bd9e48b72738b576be0049 SHA-256: cef969e44b370cb8353d8e77d05a91fc3362fe7d0869d5fb1eb45ff0341d99fe
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs and a document body that promotes free in-game items for popular games, indicating a lure for users to click on malicious links. The heuristic findings confirm the presence of a large number of external links, many of which are structured as SEO-friendly slugs, suggesting a link farm designed to redirect users to potentially harmful content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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-royal-high-free-diamonds-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/get-ur-roblox-account-hacked-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/skin-for-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-hack-computer-no-app-download-computer-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/best-free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-in-roblox-on-ipad-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-free-excutor_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/www-roblox-com-games-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/daily-coin-master-free-spin-apk_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_off00002c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C09 21960 bytes
SHA-256: 28eb8ab369828b9961b429a228e7e4ea6addfb474a50b7a04216c04d286c3435
font_01_sfnt_off00005ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA7 19720 bytes
SHA-256: 100924450083083a4cfb5b0befb338e1910388cd3b61ad69666bb082e639b35a

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