Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9694729cdf6bb7…

MALICIOUS

PDF

47.7 KB Created: 2021-06-03 11:59:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 35d31837d97e2cb4035c1fae5bbc433b SHA-1: 1b16814f664628d464ec41851ed9208d951c8ca1 SHA-256: 4c9694729cdf6bb7e37fa283b3ee28b6f9baf3f285a7baee5dc883dcfe0dba61
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into interacting with malicious content. It contains an embedded URI pointing to a URL that likely serves as a download source for a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/how-to-hack-in-arsenal-game-hack
    • https://digilib.stikesindramayu.ac.id/repository/how-to-scam-on-roblox_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-com_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/how-to-free-robux_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdf
    • https://digilib.stikesindramayu.ac.id/repository/free-minecraft-skins-girl_GM479516143.pdf
    • https://digilib.stikesindramayu.ac.id/repository/robux-com-free-robux_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/is-minecraft-realms-free_GM479516143.pdf
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-spin-hack-without-verification_GM406889139.pdf
    • https://digilib.stikesindramayu.ac.id/repository/free-coin-spin-coin-master_GM406889139.pdf
    • https://digilib.stikesindramayu.ac.id/repository/how-to-hack-minecraft_GM479516143.pdf
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-free-spin-today_GM406889139.pdf
    • https://digilib.stikesindramayu.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/www-bandicam-com-free-robux_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/roblox-hair-for-free_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/is-free-robux-real_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-gen_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-spin-link-today-2021_GM406889139.pdf
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-spin-free_GM406889139.pdf
    • https://digilib.stikesindramayu.ac.id/repository/free-minecraft-worlds_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000504b.bin
ac94dded06fec81f227cb3cc96413b115d48b1dc1d353f1900a3011cfe168aaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x504B 24872 bytes
font_01_sfnt_off00008834.bin
fa93de321190668b294ff46149e4b98ac349b4fd022dcee9ecd964f7f59f3f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8834 6768 bytes
font_02_sfnt_off00009873.bin
2ee2d72c9f8106232dd4d475232b278a4f40f0923d5703e5df1f07c18625cce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9873 17976 bytes

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