Malicious PDF — malware analysis report

Static analysis result for SHA-256 787fa5d04d8ab804…

MALICIOUS

PDF

40.3 KB Created: 2021-04-27 16:16:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d2501704418fee76681f4e5d6d770c86 SHA-1: d9a47f7639cb994a62beedb5cb6e13ba587757ea SHA-256: 787fa5d04d8ab80493a08cddcdec74892294ccb5f1e45cb68ee8ad5f718a3a0b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple invisible links, two of which are specifically identified as CAPTCHA-themed lures. These links direct users to external websites, including one hosted on 'netcdn.xyz' which appears to be a lure for free in-game items. The presence of these deceptive links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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/get-a-free-dominus-from-roblox-toy-game-hack PDF link annotation
    • http://www.saburai.ac.id/elibrary//repository/free-robux-generator-recaptcha.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/sword-fighting-roblox-game-free-to-copy.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/cheat-to-win-obby-roblox-yt.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/forum-comment-cheat-sur-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/skin-hack-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-free-robux-proof.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-no-buying-armanda.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-lumber-tycoon-tg-hacks.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-roblox-video.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/80-robux-for-free.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
stream_003_off00004234.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4234 24936 bytes
SHA-256: a47cda46f8eb1c74b2112f9810614734652d1f1ec84ebd560e411c2fdeb4c155
font_01_sfnt_off000079bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79BF 18920 bytes
SHA-256: aa44f58c8a0eb01806f92835574196680771249d8f7ca602a18e65b1f3db71ae

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