Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada4ff4b76f6afed…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 08:57:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: de3e9a32ac0e0fd7ecd79a0ae78762be SHA-1: 7d68d923414fbf1462a4694a63ca57abf7c14ddf SHA-256: ada4ff4b76f6afed61933fb6432abbc5fed1794cd9f16ec13c615cb91e51c107
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are presented as download opportunities for game-related content, such as 'free robux' or 'coin master spins'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lures point towards a phishing or malware distribution attempt.

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.tw/app/431946152/roblox-moderators-game-hack
    • https://sisomdethospital.com/ckfinder/userfiles/files/how-do-i-get-free-robux_GM431946152.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/how-to-get-free-robux-2021-not-patched_GM431946152.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/coin-master-hack-without-human-verification_GM406889139.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/coin-master-free-daily-spins-2021_GM406889139.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/free-spins-coin-master-links-no-human-verification_GM406889139.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/free-robux-no-eyes-no_GM431946152.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/free-minecraft-alt-generator_GM479516143.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/buy-tiktok-followers-free_GM835599320.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/minecraft-windows-10-mod-menu_GM479516143.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/how-to-get-the-hacked-face-on-roblox_GM431946152.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/robux-hack-free-robux_GM431946152.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/coin-master-hack-no-human-verification-2021_GM406889139.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/free-robux-games-on-the-front-page_GM431946152.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/minecraft-survival-hacks_GM479516143.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/roblox-apocalypse-rising-hack-december-2021_GM431946152.pdf
    • https://sisomdethospital.com/ckfinder/userfiles/files/free-robux-com-real_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000312f.bin
b9312721ab1f206373028c028a48144f023debe3003f13131eb1201c1f081175		 pdf-font-stream PDF embedded font (sfnt) at offset 0x312F 21512 bytes
font_01_sfnt_off00006062.bin
c9d852ee3d1c2440833dae6aa7c06b9bea994edf728c721d6eb665774c0b0edb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6062 18960 bytes

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