Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a35c69350adb36f…

MALICIOUS

PDF

36.8 KB Created: 2021-07-05 17:49:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c3cf28a01b299322c16891ac8388c068 SHA-1: f8b5d8644669de2413501958a17dfcac40dc676c SHA-256: 3a35c69350adb36fb4448fbcd1c9a785fb31b73c7871cf5869b72d32af9eb04a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The primary malicious URL identified is http://netcdn.tw/app/431946152/www-free-robux-com-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering lure designed to lead users to potentially malicious content or further compromise. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/www-free-robux-com-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-2021-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-4now-info-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-codes-for-boku-no-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-videos_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-verification-ipad_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-gift-card-codes-list_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coding-script-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/robux-hacks-that-actually-work-for-everyone-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-robux-for-free-inspect-element_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-do-you-make-a-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/robloxcom-avatar-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/robux-gratis-2021-hack_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_off00003458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3458 23652 bytes
SHA-256: 61fb0ae812c3b50187dbc3a54552e0432e7b2eb34b502f07b8328d38a492add3
font_01_sfnt_off000069ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69EE 19336 bytes
SHA-256: a173ff8a3a1fb1a8f757a1ab0f7adc35a375ad8a6d6bf5003b7cfea3ec8bf678

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