Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb485c44a814bab5…

MALICIOUS

PDF

44.7 KB Created: 2021-06-08 12:27:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 419ce8b8de138afcc4d07467ec2c3bec SHA-1: 87ed65de38240be4beea3ef1f23d8636867782ec SHA-256: cb485c44a814bab554af04540e0a743835615a1793fd95b00aa91c5d3f6a3a22
82 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, presenting a fake CAPTCHA or human verification prompt to trick users into interacting with it. The embedded URL, 'https://netcdn.tw/app/431946152/hack-formum-roblox-game-hack', likely serves as the destination for this deceptive interaction, potentially leading to further exploitation or malware download. 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/hack-formum-roblox-game-hack
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/coin-master-hack-for-android_GM406889139.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-coin-master-cards_GM406889139.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/how-to-hack-people-in-roblox_GM431946152.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-tiktok-followers-no-survey_GM835599320.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-tiktok-video_GM835599320.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/how-to-give-robux-on-mobile_GM431946152.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-robux-today_GM431946152.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/coin-master-free-spins--spins_GM406889139.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-spin-in-coin-master_GM406889139.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/roblox-t-shirt-free_GM431946152.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/does-roblox-premium-expire_GM431946152.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/get-free-robux-generator_GM431946152.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-admin-roblox_GM431946152.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/coin-master-hack-tool-without-verification_GM406889139.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/how-to-hack-roblox-2021_GM431946152.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/20210-robux_GM431946152.pdf
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-robux-without-doing-anything_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050fa.bin
cb33fbaad638b9a8945d89f7473677bd3b2d27df8e88838e714f23e8af1420d3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FA 25020 bytes
font_01_sfnt_off00008aca.bin
08276ad722f7e70c17bb31fb9dd28b031aca1ba268992dbddf06e12ecf823e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACA 18744 bytes

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