Malicious PDF — malware analysis report

Static analysis result for SHA-256 695872c7e2eb8c37…

MALICIOUS

PDF

45.5 KB Created: 2021-06-07 00:52:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 25bfe9453fc16e6e6d33f522d003bb2e SHA-1: 09b9304276d78912892fbc1dd3e12f1bf98dcffe SHA-256: 695872c7e2eb8c3770f32923f5d0d8de0fca8b04e7d6e0e8e67d6992d191875c
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into interacting with malicious links. The embedded URLs and document body content strongly suggest a lure related to game cheats and hacks, aiming to redirect users to potentially malicious websites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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/how-to-get-a-free-redeem-code-for-roblox-game-hack
    • http://library.stembi.ac.id/repository/roblox-speed-hack_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-robux-easy_GM431946152.pdf
    • http://library.stembi.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdf
    • http://library.stembi.ac.id/repository/free-roblox-clothes-and-hair_GM431946152.pdf
    • http://library.stembi.ac.id/repository/is-minecraft-dungeons-free_GM479516143.pdf
    • http://library.stembi.ac.id/repository/roblox-studio-free-robux_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdf
    • http://library.stembi.ac.id/repository/how-do-u-hack-roblox_GM431946152.pdf
    • http://library.stembi.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://library.stembi.ac.id/repository/how-to-get-free-robux-on-roblox-meep-city_GM431946152.pdf
    • http://library.stembi.ac.id/repository/roblox-com-free-robux_GM431946152.pdf
    • http://library.stembi.ac.id/repository/minecraft-windows-10-hacks_GM479516143.pdf
    • http://library.stembi.ac.id/repository/play-minecraft-online-free_GM479516143.pdf
    • http://library.stembi.ac.id/repository/free-tiktok-views_GM835599320.pdf
    • http://library.stembi.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://library.stembi.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdf
    • http://library.stembi.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-robux-generator_GM431946152.pdf
    • http://library.stembi.ac.id/repository/how-to-get-free-robux-codes_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-tiktok-accounts-with-followers_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000522c.bin
92a6bba4127cc21b1213673b90f0a70e94300cac0ff34374e9d4fc1edfe026ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522C 25740 bytes
font_01_sfnt_off00008e20.bin
24599b4fb7cef516c46a278c9f8347d7aeecb46e3e2fce4dc086a1df8041dace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E20 18648 bytes

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