Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6652a21d9e11f93…

MALICIOUS

PDF

35.1 KB Created: 2021-06-20 15:56:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 15134f732820ee1b7c767a057757879a SHA-1: 8f876058588f3f612041e8c7b6c1d9db0234237e SHA-256: b6652a21d9e11f9369d8796df032223b2d8927151e0ccd01bc8848e0f285d688
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains and known malicious infrastructure, disguised as 'free generator / game hack' lures. These links likely lead to further malicious content or downloads. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs and heuristic firings clearly indicate a phishing or malware distribution attempt.

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.co/app/431946152/free-robux-easy-cheat-game-hack In PDF document text
    • http://pesok-rk.ru/images/easy-robux-hack-com_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/how-to-hack-roblox-on-android-tablet_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-free-master_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/hacker-mask-roblox_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-today_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/win-free-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-pink-hair-roblox_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/hacking-troll-2021-ultimate-driving-cars-review-roblox_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/roblox-free-body_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/what-game-does-not-hack-you-when-you-get-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/how-to-use-roblox-hack-scripts-free_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/hacked-roblox-accounts-list_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
font_00_sfnt_off00003203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3203 22480 bytes
SHA-256: 5638fa310f122dc566cf1cbdb1f0146cbd254fe7b1dc4c01c714f8caa0053f13
font_01_sfnt_off000063f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F9 19164 bytes
SHA-256: 38bcbc9fda7b76342ace9e36562526ad6e4336e22a8b899696d98bd2859a47cb

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