Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc49c95d8c8be16…

MALICIOUS

PDF

43.2 KB Created: 2021-06-09 05:34:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 24c29c7163f50cf0af1eac273c687483 SHA-1: d57a48261e7b64678b58a283614cef61842f32ac SHA-256: fbc49c95d8c8be16d6e130fba6414b76c8c496e6d977c52e7965126bca4d90c7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a malicious lure, including a fake CAPTCHA prompt designed to trick users into interacting with the content. It contains a large number of external links, many pointing to PDF files hosted on similar domains, suggesting a link farm or redirection scheme. The primary URL identified is https://netcdn.tw/app/431946152/hack-avatar-roblox-game-hack, which likely serves as a gateway to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/hack-avatar-roblox-game-hack
    • http://library.atim.ac.id/repository/free-candy-id-for-roblox_GM431946152.pdf
    • http://library.atim.ac.id/repository/robux-for-surveys_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-get-free-premium-roblox_GM431946152.pdf
    • http://library.atim.ac.id/repository/minecraft-alt-accounts-free_GM479516143.pdf
    • http://library.atim.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdf
    • http://library.atim.ac.id/repository/coin-master-free-coins-generator_GM406889139.pdf
    • http://library.atim.ac.id/repository/minecraft-xray-hack_GM479516143.pdf
    • http://library.atim.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdf
    • http://library.atim.ac.id/repository/www-free-robux-com_GM431946152.pdf
    • http://library.atim.ac.id/repository/minecraft-pocket-edition-free_GM479516143.pdf
    • http://library.atim.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://library.atim.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • http://library.atim.ac.id/repository/coin-master-hacks-no-surveys_GM406889139.pdf
    • http://library.atim.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-earn-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-robux-no-verification_GM431946152.pdf
    • http://library.atim.ac.id/repository/get-free-spins-in-coin-master_GM406889139.pdf
    • http://library.atim.ac.id/repository/coin-master-free-spins-today-new_GM406889139.pdf
    • http://library.atim.ac.id/repository/coin-master-hacks_GM406889139.pdf
    • http://library.atim.ac.id/repository/unlimited-free-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004cf5.bin
24bc58aa3cdb73e8248ca624618cfa888427fac9088f714242699d6447120786		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF5 24704 bytes
font_01_sfnt_off00008578.bin
cf25c97a3959ef1d69103be186516878a323d7e8d5e64907e52b35f1dc57a72d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8578 18400 bytes

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