Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3539a47ebd035bd…

MALICIOUS

PDF

41.9 KB Created: 2021-05-18 03:22:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 77c05c1404ec836f844762f3cb2e2e0a SHA-1: 8c6dec93951bfd4dafa3100391d8037e1aa60c61 SHA-256: c3539a47ebd035bd5d605b5c727c30fe27a20fa2ab08a4afdc7a654a298df4fb
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple external links, with a high-confidence heuristic identifying a lure related to 'free generator / game hack'. The document body, though heavily obfuscated, contains references to 'Free Robux' and directs users to URLs such as 'https://netcdn.xyz/app/431946152/free-robux-exe-game-hack'. This suggests the PDF is designed to trick users into visiting malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/free-robux-exe-game-hack PDF link annotation
    • http://firesafetyservices.biz/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/roblox-top_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/wurst-client_GM479516143.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coinmaster-spin-ml-link_GM406889139.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_off00004907.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4907 25076 bytes
SHA-256: 44348ce1868b33c6941aa4b6f3c7e9e03add6ab06c112a4f2088d47ae208f3a8
font_01_sfnt_off00008229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8229 18012 bytes
SHA-256: 1e3fda203f08fe42ab00f6cef97e605bb68f7e374108f28afe3c353055d0c9d6

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