Malicious PDF — malware analysis report

Static analysis result for SHA-256 6418155809bad659…

MALICIOUS

PDF

44.4 KB Created: 2021-06-09 05:15:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6f6c842524fcde9fb428941ea3aeae8c SHA-1: 517a77826d8a63bb9dc1144a42c9ced48c4dabfb SHA-256: 6418155809bad659c7884175fa7b785f4ec0601298c6c679fb4b4addea7d0fb5
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document presents a fake CAPTCHA and a browser extension installation lure, indicating a social engineering attempt to deceive the user. The embedded URLs, such as https://netcdn.tw/app/431946152/err-face-roblox-free-game-hack, likely lead to malicious content or further infection vectors. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/err-face-roblox-free-game-hack PDF link annotation
    • http://digilib.uim.ac.id/repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-phantom-forces-hack-free_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-devil_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/como-hackear-uma-conta-no-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/mistplay-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/youtubers-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EBD 25736 bytes
SHA-256: 52537eedc12f994cf16ff4ca386d94cb05769da2c56bfe317db911657bcfba36
font_01_sfnt_off00008b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B34 18176 bytes
SHA-256: b69dc840291515e54e4d7bfc8bf23859e1d55264f50ecb11a0c1b0acbc5217c3

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