Malicious PDF — malware analysis report

Static analysis result for SHA-256 640eb5c93bd4d8b4…

MALICIOUS

PDF

48.5 KB Created: 2021-06-09 15:58:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 71a7d74fed7a33a2d5202a4fa901dc46 SHA-1: 7b548687999db5c1e8495ca58249a20cc56fcab4 SHA-256: 640eb5c93bd4d8b405e1c25b528b1ef5b960294d18d8dd9d008b7c7f33efacaf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, masquerading as game hacks or generators. The primary lure appears to be related to 'Roblox' and 'Coin Master' cheats. The document body, though heavily obfuscated, contains references to these lures and the malicious URL. The presence of multiple malicious links and the ML classifier strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

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.tw/app/431946152/roblox-t-shirt-black-free-game-hack In PDF document text
    • http://uristdona.ru/images/gold-cards-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://uristdona.ru/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/roblox-dominus-for-free_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://uristdona.ru/images/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://uristdona.ru/images/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/roblox-boost-com-hack_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/real-free-robux-generator_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_004_off000051d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D8 29888 bytes
SHA-256: f217aee41292822423bb2ba5362661714563c71982cd36f0e2dfb7dee3b69e79
font_01_sfnt_off00009a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A14 18736 bytes
SHA-256: 0dd7ed866194f57ebb62edd8b7ebbf73c90d7ce4f92c31422a5ed53a3fb094d3

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