Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f76b8d098e014a…

MALICIOUS

PDF

34.8 KB Created: 2021-06-28 22:06:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bb7880a04da19de1dcb1d2cda68cb7f5 SHA-1: 29213a9d6c51f71080a9a87e9beb88b83affdd2a SHA-256: c5f76b8d098e014a2cae8c3aef4b86ee2228b418b3739a59e0694913cc72cdd4
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or verification prompt, a common social engineering tactic to trick users into downloading malicious files. The embedded URLs, such as http://netcdn.co/app/431946152/roblox-superhero-package-free-game-hack, likely lead to the download of a second-stage payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-superhero-package-free-game-hack
    • http://pustaka.industri.ft.unand.ac.id/repository/free-roblox-accounts-2021-dantdm_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/v3rmillion-free-roblox-injector_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/how-to-get-group-clothes-free-on-roblox_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/roblox-how-to-get-free-robux-june-2021_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/how-to-hack-admin-roblox-dll_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/minecraft-free-download-iphone_GM479516143.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/roblox-bloxburg-free-money-glitch_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/roblox-hack-generator-robux_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/ww-robux-hack-top_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/ways-to-earn-robux-for-free_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/https-webrobloxcom-catalog-202163-hair-free_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/roblox-free-ninja-animation_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/how-to-speedhack-roblox-with-cheat-engine_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/roblox-robux-hack-generator-survey-and-no-download_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/energize-roblox-hack_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/how-to-get-an-item-for-free-on-roblox_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/how-to-hack-free-robux-2021_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/free-fall-roblox_GM431946152.pdf
    • http://pustaka.industri.ft.unand.ac.id/repository/get-free-robux-without-sighning-in_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003207.bin
427b22199b6785c72a444d799215d784cd34c72d95319c43a9dec1c3c051ecd6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3207 21808 bytes
font_01_sfnt_off0000622a.bin
ac8571e5c49f9d8c9503e12ff87573b83a76a7d0e18e879015d81f654c20b83f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622A 19456 bytes

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