Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d015d828f8e8c3…

MALICIOUS

PDF

33.5 KB Created: 2021-07-06 05:03:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3054e48e9999f2c78fcdb26571f2ac42 SHA-1: 49f1bfca796be5d00e83c677e78a7976db8be9f7 SHA-256: 90d015d828f8e8c333b3aea6516e30783047dfdd0922e544c55a8cb8171b515f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that are designed as lures for game-related hacks and free currency. The primary URL, http://netcdn.tw/app/431946152/redeem-roblox-card-free-game-hack, is directly linked to a 'free generator / game hack' lure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware download. The ML classifier also flagged this PDF as malicious with high confidence.

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/redeem-roblox-card-free-game-hack PDF link annotation
    • http://slim.sisminkada.net/repository/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-no-human-verification-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-roblox-keyboard-clicker-download_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-roblox-retail-tycoon-pc_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/gain-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-tower-defense-simulator-hack_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-free-tops_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-800-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-cheat-source-leaked_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/best-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-cash-cheat_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C2E 22204 bytes
SHA-256: 00cc04df48065ecfb60622778e33c070cb0a34926e1dcf80d0ea5bd6f52af0b5
font_01_sfnt_off00005d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9B 19084 bytes
SHA-256: 28b83e4f342e4f09a2889314eefb4cea0c2396b4c6f42210c3755af6e96d1200

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