Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7b584d6fc7531f…

MALICIOUS

PDF

44.6 KB Created: 2021-05-19 10:45:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 13fd1447926c15fc1fa23629cab1d6e2 SHA-1: f19070c6dd9431e9624bcfa2e4f1702908d5f4e1 SHA-256: 6b7b584d6fc7531f39b2d85f182b0c3acdda0f3c32219e66a74bb7534e28cf22
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically advertising 'free Robux' and game hacks. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users with game-related content to a redirector, likely to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/431946152/real-free-robux-codes-game-hack In PDF document text
    • http://paro.net.ua/images/rbx-com_GM431946152.pdfIn PDF document text
    • http://paro.net.ua/images/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://paro.net.ua/images/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://paro.net.ua/images/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://paro.net.ua/images/get-free-coin-master_GM406889139.pdfIn PDF document text
    • http://paro.net.ua/images/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://paro.net.ua/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://paro.net.ua/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://paro.net.ua/images/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • http://paro.net.ua/images/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://paro.net.ua/images/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://paro.net.ua/images/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://paro.net.ua/images/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://paro.net.ua/images/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://paro.net.ua/images/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://paro.net.ua/images/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • http://paro.net.ua/images/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://paro.net.ua/images/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • http://paro.net.ua/images/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://paro.net.ua/images/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000045a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45A1 25240 bytes
SHA-256: 58830bbfe530ff359f0f427f9ce3e372e4a5d298c0f4005f34aaa95a29925d00
font_01_sfnt_off00007e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2C 3928 bytes
SHA-256: e74f895bd9277b0b0162feefce2cb4a319c55226065157fb04455274bdd0ba98
font_02_sfnt_off00008b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B13 18492 bytes
SHA-256: 6ff68d48ac5036b960fd78490347d8f271b820cb13d1967b9212c8abd8834c8c

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