Malicious PDF — malware analysis report

Static analysis result for SHA-256 5faf66a9b1e8ebce…

MALICIOUS

PDF

34.5 KB Created: 2021-06-21 22:23:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bb8ef7246647a75574e8ba6b1b7059b4 SHA-1: e7c9753620b663065c3188e99374671f7e586a99 SHA-256: 5faf66a9b1e8ebce2d7f7c09b83090b351f4a98577353397cab364c471e4355e
102 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources related to game cheats and free items, indicating a lure for users to click and potentially download further malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the ML classifier strongly suggest malicious intent. The primary IOC is the initial download URL, which likely leads to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/room-cheats-roblox-game-hack PDF link annotation
    • https://www.kaojen.com.tw/upload/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-roblox-party-favor-tags_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/mcpe_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-robux-non-scam-or-hack_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-hack-roblox-to-get-free-robux_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_off000031b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B1 21964 bytes
SHA-256: 2c3fa313a9f7b040a52804c941641e208552f1ff56afc3eb23a8fbd02ed258af
font_01_sfnt_off000061f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F0 19016 bytes
SHA-256: f9ca2406e3f728a38e7e6af72ef7d4d7b8d1e49d156a8cd6d1aa0ea552508aa5

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