Malicious PDF — malware analysis report

Static analysis result for SHA-256 6430bd4044b99bb4…

MALICIOUS

PDF

43.8 KB Created: 2021-06-11 13:24:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9b7811db1e610ba96c82f087cba57537 SHA-1: dd6a42c34a559750b76031bae21b408bbd26e9d9 SHA-256: 6430bd4044b99bb4ca749ebd0b1bccab4ca3885844366c4214c289b08161347b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document displays a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The embedded URL, https://netcdn.tw/app/431946152/roblox-wikia-free-robux-game-hack, likely leads to a second-stage payload or phishing site. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/roblox-wikia-free-robux-game-hack
    • http://repository.ummy.ac.id//repository/coin-master-com_GM406889139.pdf
    • http://repository.ummy.ac.id/repository/free-robux-by-inspecting_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-mod_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/hack-coin-master-app-ios_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/hacks-para-roblox_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/roblox-hack-me_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-daily-spin-free_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/free-coins-coin-master-hack_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/robux-generator_GM431946152.pdf
    • http://repository.ummy.ac.id/repository/promo-code-that-gives-you-free-robux_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/unlimited-robux-2021_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/heroes-online-roblox_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdf
    • http://repository.ummy.ac.id//repository/free-robux-without-verification-or-survey_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-spins-coin-master-app_GM406889139.pdf
    • http://repository.ummy.ac.id/repository/ho2-to-get-free-robux_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-coins-coin-master_GM406889139.pdf
    • http://repository.ummy.ac.id/repository/free-tiktok-followers-no-human-verification-2021_GM835599320.pdf
    • http://repository.ummy.ac.id//repository/how-to-hack-minecraft_GM479516143.pdf
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-link-no-verification-code_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d27.bin
56ede934d0688b43956bfddc3f425a3e4d82dd7b8025a8dc1f0c255c927e8d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D27 25880 bytes
font_01_sfnt_off000086ef.bin
cdd07c20cd8e8a3b68b12e830c4f29343c42b872234cf72887c288d0cced510c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86EF 18804 bytes

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