Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ea3555dc86e0f2…

MALICIOUS

PDF

36.9 KB Created: 2021-07-05 16:40:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6807694ddfe81dc41d0b1faac290272d SHA-1: ec28b6c9b6c5c3af6101dcf22d689d26c88cd1a9 SHA-256: 55ea3555dc86e0f289deafe2b61396d26454d18f2b732f0a408d49f323e8899f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free currency to entice users to click on links. These links lead to malicious redirectors that host further malicious PDFs, indicating a multi-stage download or redirection scheme. The ML classifier strongly supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-gold-cards-link-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-hack-sin-verificacion_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-legal-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/is-overdrive-roblox-exploit-free_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/gun-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/get-free-obc-on-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-unused-roblox-game-cards_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-an-account-in-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/best-roblox-hack-sites_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/cheat-engine-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-free-adidas-shirt_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-blodfiest-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/brdarski-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-cheats-codes_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-para-roblox-final-stand_GM431946152.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-In 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_002_off00003747.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3747 23824 bytes
SHA-256: 89da889119cdd29078e893b42b55987c0edaf23e17b51ca132cb9868ae9b779e
font_01_sfnt_off00006d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D83 18416 bytes
SHA-256: 89113b1104d7a8f0ec89d4a785a1cf441d54076bb8a1f1cdfa29711bc1c2c75d

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