Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36de93c49c909bb…

MALICIOUS

PDF

33.4 KB Created: 2021-07-24 18:21:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5195572ec2f3e56f404a8eba3b02e249 SHA-1: ed772290389975c3e0456c7e683b012c880d3e0b SHA-256: b36de93c49c909bb7c8f4ca420d1125969507dd2c0b38a0582f905ddacb7a94f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games. These redirectors lead to further malicious PDFs hosted on domains like kierowcyhgv.uk. The document body explicitly contains the primary malicious URL and a call to action, indicating a social engineering lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/free-coin-master-coins-game-hack In PDF document text
    • https://kierowcyhgv.uk/images/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/robux-free-2021_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_002_off00002e45.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E45 23148 bytes
SHA-256: 6ddc56692ae8de6e2482c58d75246037fe5d909e8924b4095ea0447623a09d89
font_01_sfnt_off00006277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6277 17712 bytes
SHA-256: effefb876c7a76aa063811ff0160e46fb8a90dd5507c6c48ef6fa39823ab5c8c