Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75d07d511f9437c…

MALICIOUS

PDF

41.7 KB Created: 2021-05-12 14:46:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ceaf0856b8cd3723eb1c225f816db059 SHA-1: a9aaf20520840ea01bd5622d40305f0621aa7d78 SHA-256: b75d07d511f9437c7df927468d45eee1d1cefa77bd2307e29d30a60415005bca
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free Robux' or 'game hacks'. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malware downloads or phishing pages. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to exploit user interest in free in-game currency.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/game-give-free-robux-game-hack In PDF document text
    • http://ikig.ru/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://ikig.ru/images/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/roblox-com-r_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
stream_003_off00004489.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4489 25500 bytes
SHA-256: f853a51fd4f210fc47bc49f4a92db8c14eebfc2f18d22557f5570e3facd1203e
font_01_sfnt_off00007f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0E 18736 bytes
SHA-256: 457049c0c0b067ea8a2ccaf5c24f39a354f8c872058b648fa686429afe9091ea

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