Malicious PDF — malware analysis report

Static analysis result for SHA-256 490fefb1b9a1bb83…

MALICIOUS

PDF

45.6 KB Created: 2021-06-10 21:08:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8b24bbb3beade0119984c1baf302ee17 SHA-1: 89f035c59b67382c369a594debb6ea9bae403b62 SHA-256: 490fefb1b9a1bb839a3fbb89bc6ee21680229dcb5cc1001cd20ca27352348c27
142 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a SEO link farm, containing numerous external links to various gaming-related content. It also presents a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking these links. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/free-roblox-gift-card-generator-2021-game-hack
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-heaven-free-spins_GM406889139.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-free-spins-only_GM406889139.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/is-minecraft-free-on-computer_GM479516143.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/best-way-to-get-free-robux_GM431946152.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/how-to-get-18-000-robux-for-free_GM431946152.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-tiktok-fans-and-likes_GM835599320.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/minecraft-windows-10-hacked-client_GM479516143.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/minecraft-free-play-no-download_GM479516143.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/games-like-coin-master-for-free_GM406889139.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-el-tiger-card-free_GM406889139.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-free-spins-daily-link-updated_GM406889139.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/robux-free-online_GM431946152.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/bloxpink-free-robux_GM431946152.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/get-me-robux_GM431946152.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-minecraft-capes-no-mods_GM479516143.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-25-spins-coin-master-links_GM406889139.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/daily-coin-master-free-spin-link-facebook_GM406889139.pdf
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/minecraft-nintendo-switch-digital-code-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051e0.bin
feeae99524f32aee7e0e7ddb89a7720f85c3276875938b3a29e28ac809df8eec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E0 25640 bytes
font_01_sfnt_off00008d67.bin
c664a727bc63afe95aa7dc50ae0affa62569c795923088c4fc4e101631e2a335		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D67 18976 bytes

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