Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf10809eb6c355e1…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 20:26:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cd40c63d22f35a24ab1a4675aeee289d SHA-1: cb98b255627e4be0425ed9ac5a31b65e843a660a SHA-256: cf10809eb6c355e177517c551e604dc1879a9b6dcaf6191c3ad8b7115e02593f
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 lure to trick users into downloading malicious content. The document body contains a URL pointing to a potential download, which is likely the intended payload. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/minecraft-pe-017-0-apk-free-download-android-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-coins-in-assassin-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-codes-2021-list_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-mod-apk-de-roblox-2_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/rbx-com_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-2021-easy-no-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-do-u-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/script-to-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-play-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-smoking-free_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_off00002f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4C 22268 bytes
SHA-256: 6cb8a9d79e66977f4c7106811c0893d08754064b16d1bc6791a35cdec326111c
font_01_sfnt_off000060d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D5 19412 bytes
SHA-256: 98bc5863a2ef94ee9cd00eb8fcbf6f31283247a252703102005365b742523eb0

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