Malicious PDF — malware analysis report

Static analysis result for SHA-256 91055efc5047097a…

MALICIOUS

PDF

54.9 KB Created: 2021-05-14 06:06:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 55599e88bdfd6173eaa93234f51a22c5 SHA-1: 8dca078a8ee9c5720067d9872cd8aea7d31551e8 SHA-256: 91055efc5047097ae79509ce07a62c432bb8b30a06b5e8c34664bfaff9b99082
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of "game hacks" and "free generators" to entice users to click on embedded links. These links lead to known malicious redirectors and potentially further malicious content. The ML classifier also flagged this PDF as malicious, supporting the observed redirection and lure techniques. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8531

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/coin-master-codes-game-hack In PDF document text
    • http://5346000.com/images/free-coins-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://5346000.com/images/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://5346000.com/images/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://5346000.com/images/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://5346000.com/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://5346000.com/images/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://5346000.com/images/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://5346000.com/images/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://5346000.com/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://5346000.com/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://5346000.com/images/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://5346000.com/images/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://5346000.com/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://5346000.com/images/code-free-robux_GM431946152.pdfIn PDF document text
    • http://5346000.com/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://5346000.com/images/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://5346000.com/images/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://5346000.com/images/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://5346000.com/images/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://5346000.com/images/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004952.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4952 27180 bytes
SHA-256: 24a10b9486bf314925b7299db8c3b1de2298b17786b5c81a20a82f68d7f26fca
font_01_sfnt_off00008942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8942 3088 bytes
SHA-256: e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222
font_02_sfnt_off0000940d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x940D 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off0000a733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA733 17720 bytes
SHA-256: e3dc30cd69473f08b9483bb660e9aeaccc8f6f74c3e4f353697525059d592d8d
font_04_sfnt_off0000c7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A4 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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