Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ceab76c935ffeb…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 18:32:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ac691ba2bd1959e6b1834d8363b5a528 SHA-1: 75e5b2749b4a0069b31b8cd8e8442b72b38bce1c SHA-256: 81ceab76c935ffebe592fbe7d9196e4b8c63d824a6ce421d3d5c4746488acbd6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and references to 'free Robux' and game hacks, indicating a social engineering lure. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the embedded URL 'http://netcdn.tw/app/431946152/free-robux-com-roblox-game-hack' strongly suggest the intent is to redirect users to a potentially malicious site. While no scripts were explicitly extracted, the nature of the lure and the high ML classifier score point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/431946152/free-robux-com-roblox-game-hack PDF link annotation
    • http://www.pspmrsmkkb.com/webopac/repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-do-u-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/new-free-stuff-on-roblox-august-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/pokemon-go-free-legendary_GM1094591345.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-hack-robux-promo-code_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/buy-anything-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/hacks-game-in-roblox-prison-life-download_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/get-free-robux-and-bc_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/robux-no-human-verification_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_off00002ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED3 21980 bytes
SHA-256: f60ef43faab9125fbc9ed2ae1b0dc5b5f940d4f2b483625f67055e43186b8d60
font_01_sfnt_off00005f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F48 19052 bytes
SHA-256: f1c402a5b139f7054ce39ccfb5800536152a5b826a5c5a7ec81e6f9b67a9d2f8

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