Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb9a3999790c558…

MALICIOUS

PDF

41.9 KB Created: 2021-05-14 23:59:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 36ba7c1e918bec842379c828d63642f8 SHA-1: 64fb13b2d94ef6322de96fdd85515337614aad2a SHA-256: cbb9a3999790c558930ae1837c5ba797b4fb585f2fb22cf28f862b3fb8233213
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically promoting 'game hacks' and free currency for popular games. The primary lure appears to be a 'free generator' for Coin Master, directing users to a malicious URL. The ML classifier also strongly indicated maliciousness. The document's content and embedded links suggest an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/como-hackear-coin-master-gratis-game-hack In PDF document text
    • http://archi-z.ru/images/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://archi-z.ru/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/play-games-for-robux_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://archi-z.ru/images/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://archi-z.ru/images/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://archi-z.ru/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://archi-z.ru/images/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • http://archi-z.ru/images/free-roblox-accounts-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_003_off00004642.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4642 26152 bytes
SHA-256: 1dd22445cd4c3d5bbbfbd97f57441870b99d162485f65107e77783c8ae3938c7
font_01_sfnt_off0000823c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x823C 17976 bytes
SHA-256: a3e9012f8e1f9d61ddd4f1d4d38951fb16594134e53f2a4a4cbd6e03026951a8

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