Malicious PDF — malware analysis report

Static analysis result for SHA-256 589334d63acd8525…

MALICIOUS

PDF

40.7 KB Created: 2021-04-28 13:24:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dca3fe0cd69c7499babde139d086101f SHA-1: ebccee2c3a9c850f8548b31034d03af60ff09036 SHA-256: 589334d63acd8525319e11d6bdfd8df07bfd0422e97de561abfb40d58fee2359
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs social engineering tactics by presenting itself as a 'Hack For Assasin Roblox' and includes multiple links designed to lure users into clicking. Several heuristics indicate that these links lead to CAPTCHA pages or redirectors, such as 'http://www.drent.se/images/how-to-get-free-robux-without-captcha.pdf'. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/hack-for-assasin-roblox-game-hack PDF link annotation
    • http://www.drent.se/images/how-to-get-free-robux-without-captcha.pdfIn PDF document text
    • http://www.drent.se/images/how-to-get-free-robux-safely-one-a-ipad-lenovo.pdfIn PDF document text
    • http://www.drent.se/images/hacks-for-framed-roblox.pdfIn PDF document text
    • http://www.drent.se/images/how-to-get-roblox-admin-for-free.pdfIn PDF document text
    • http://www.drent.se/images/roblox-hack-2021-ad.pdfIn PDF document text
    • http://www.drent.se/images/hack-for-roblox-bee-swarm-simulator.pdfIn PDF document text
    • http://www.drent.se/images/obc-roblox-hack.pdfIn PDF document text
    • http://www.drent.se/images/dragon-ball-online-revelations-roblox-hack.pdfIn PDF document text
    • http://www.drent.se/images/how-to-use-mega-to-hack-roblox.pdfIn PDF document text
    • http://www.drent.se/images/how-to-get-free-robux-2021-instantly.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_off00003f5c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3F5C 27712 bytes
SHA-256: eb3387ed9e4e26bc4fb4af0f11d43bb0c9e4b38c6a1150dcb0e2f3a24ffc958f
font_01_sfnt_off00007cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC8 18468 bytes
SHA-256: 205f1f65cdf305b77a1b1fc546b364e19988664708ae5c1b9d43ab6d985b664f

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