Malicious PDF — malware analysis report

Static analysis result for SHA-256 0845280eec996591…

MALICIOUS

PDF

47.8 KB Created: 2021-06-08 18:22:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3af12805e50c3ffa390a2ff7ec27cf9e SHA-1: e87c57179983f0b0e92731dada315f186e5f59d2 SHA-256: 0845280eec996591aa87327364cc6ffd39fc6a28a2acf600bdd271ca0199515e
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA lure to entice users to click on an embedded URL, which is a common tactic for delivering malicious payloads. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of a fake CAPTCHA and external URLs suggests an attempt to trick the user into downloading and executing further malware.

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.tw/app/431946152/free-shirts-roblox-happydave-game-hack
    • https://repository.poltekkesgorontalo.ac.id/repository/daily-free-spin-link-for-coin-master_GM406889139.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/coin-master-spin-hack_GM406889139.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/roblox-dominus-free_GM431946152.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/free-robux-offers_GM431946152.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/coin-master--hack_GM406889139.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/spin-coin-master-hack_GM406889139.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/hacker-minecraft-song_GM479516143.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/download-hack-coin-master-apk_GM406889139.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/tiktok-free-80_GM835599320.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/master-coin-free_GM406889139.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/coin-master-daily-free-spin-and-coin_GM406889139.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/free-spin-coin-master-app-download_GM406889139.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdf
    • https://repository.poltekkesgorontalo.ac.id/repository/rbl-gg-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f94.bin
4e97428e72f2c18d0051c26344a86af70b87b45c5c4bef015bffefd995f84757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F94 25704 bytes
font_01_sfnt_off00008b61.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B61 2880 bytes
font_02_sfnt_off0000954b.bin
ce19bfd5f39c26b650ce7f554f64cd961d60c708ef082fb43b3e1b7f26079625		 pdf-font-stream PDF embedded font (sfnt) at offset 0x954B 19208 bytes

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