Malicious PDF — malware analysis report

Static analysis result for SHA-256 29cd2351a4d83f5d…

MALICIOUS

PDF

49.6 KB Created: 2021-05-13 13:36:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 66272576e8b24991ff1c70bb8bba139b SHA-1: 9824c4fd7c89e74e48376be89ca7195cf90fd939 SHA-256: 29cd2351a4d83f5dc7f89d28e63edf97edb19bbe7d40c2ebb4dac00b16f14655
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure, aiming to trick the user into clicking a link to download a payload. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-kid-friendly-no-human-verification-game-hack, likely serves as the initial download point for further malicious activity. The ML classifier strongly flagged this PDF as malicious, supporting the observed attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.xyz/app/431946152/free-robux-kid-friendly-no-human-verification-game-hack
    • https://bancroftandsons.com/images/free-robux-link_GM431946152.pdf
    • https://bancroftandsons.com/images/free-links-for-coin-master_GM406889139.pdf
    • https://bancroftandsons.com/images/rbxoffer-com-free-robux_GM431946152.pdf
    • https://bancroftandsons.com/images/mcpe-master-free-coins_GM406889139.pdf
    • https://bancroftandsons.com/images/free-coins-coin-master-haktuts_GM406889139.pdf
    • https://bancroftandsons.com/images/minecraft-free-computer-game_GM479516143.pdf
    • https://bancroftandsons.com/images/free-roblox-gift-card_GM431946152.pdf
    • https://bancroftandsons.com/images/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • https://bancroftandsons.com/images/master-free-spin-and-coin-links-html-m-1_GM406889139.pdf
    • https://bancroftandsons.com/images/coin-master-server-hack_GM406889139.pdf
    • https://bancroftandsons.com/images/free-spin-link-coin-master-today_GM406889139.pdf
    • https://bancroftandsons.com/images/how-to-get-free-robux_GM431946152.pdf
    • https://bancroftandsons.com/images/free-robux-hack-us_GM431946152.pdf
    • https://bancroftandsons.com/images/www-coin-master-hack_GM406889139.pdf
    • https://bancroftandsons.com/images/coin-master-free-spins-no-survey_GM406889139.pdf
    • https://bancroftandsons.com/images/how-to-really-hack-coin-master_GM406889139.pdf
    • https://bancroftandsons.com/images/coin-master-spin-hack-link_GM406889139.pdf
    • https://bancroftandsons.com/images/minecraft-apk-download-free-11-055_GM479516143.pdf
    • https://bancroftandsons.com/images/free-robux-no-survey_GM431946152.pdf
    • https://bancroftandsons.com/images/free-roblox-gift-card-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004883.bin
3e8e29b59989990f822a2b6c71fb9a4c5197226e775f0445dae3c138f7346ce4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4883 38064 bytes
font_01_sfnt_off00009d2e.bin
ea469787df873758e357019bb53a1e3c4242eb718badaf8706c42bdc2f61c813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D2E 19288 bytes

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