Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6d27179e13a289…

MALICIOUS

PDF

45.5 KB Created: 2021-06-10 22:17:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1f96c99f1ea6c23eb00b646b0447a88c SHA-1: e06e0ef8d7769eb99ca4458001a4e3468f07e273 SHA-256: 9d6d27179e13a289634f18314f60c2311b3333f5b7b737960ff1bf4e706a24c1
142 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which appear to be part of a link farm designed to attract users with lures like 'free Robux' or game hacks. The presence of a fake CAPTCHA heuristic strongly suggests a user interaction-based attack, where clicking a link or performing an action is intended to initiate a malicious download or execution. The ML classifier also flagged this PDF as malicious with high confidence.

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-game-that-gives-you-free-stuff-game-hack
    • http://digilib.ulm.ac.id/pusat/repository/wurst-client-download_GM479516143.pdf
    • http://digilib.ulm.ac.id/pusat/repository/25-free-spins-coin-master_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-coins-coin-master-blog_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-2021-free-spins-link-today_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/pokemon-go-free-3d_GM1094591345.pdf
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-pe-free-apk_GM479516143.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-gift-card-codes-2021-unused_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-jackpot-madness-hack_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/youtube-how-to-get-free-robux_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/my-roblox-account-was-hacked_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/haktuts-coin-master-free-spins-2021_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/robux-for-kids_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-into-roblox-accounts-2021_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-link-app_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-picture_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050c7.bin
7714fdfc8d24004e88ffa30f6855713cf28f1f242700daf7a778623cdddaf7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50C7 26408 bytes
font_01_sfnt_off00008c92.bin
a562b16382c3d116f2a488be0e1005cd480ffb03b46733987c6c11e52177e7e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C92 19240 bytes

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