Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ba85355e21a75b…

MALICIOUS

PDF

45.7 KB Created: 2021-06-07 08:25:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1840003cfa926ce001a93f4f15c4aae1 SHA-1: 6bac05cdf821ea18675a74a86cd08bb4069457fc SHA-256: b8ba85355e21a75be2d6f3c23cc370e3a5066c130eea8bdfb1d2493a222afeba
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure and multiple embedded links, many of which point to a link farm of other PDFs. The primary URL, https://netcdn.tw/app/431946152/roblox-free-shirts-template-game-hack, suggests a lure for game-related cheats or exploits. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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/roblox-free-shirts-template-game-hack
    • http://opac.pps.uin-alauddin.ac.id/repository/pokemon-go-free-avatar-items_GM1094591345.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/robux_GM431946152.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/free-roblox-accounts-2021_GM431946152.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-spin-software_GM406889139.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-facebook-page_GM406889139.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/free-minecraft-server-hosting-24-7_GM479516143.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/give-me-free-robux_GM431946152.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/free-spins-coin-master-android_GM406889139.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-hack-coin-master-root_GM406889139.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/robux-hacks-2021_GM431946152.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/free-star-codes-roblox_GM431946152.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/www-free-robux-com_GM431946152.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-win-free-robux_GM431946152.pdf
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-free-followers-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005202.bin
5ed9011473bc5b8a50e9a69937b42c61065fb0e48ae0a9468a8fe3d413ff7424		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5202 26496 bytes
font_01_sfnt_off00008e2c.bin
739486d75a434cd616693a8665a5172d8af2d8656b16a7d7b98b432f0908d272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2C 19000 bytes

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