Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb4cace4e0cd24f…

MALICIOUS

PDF

34.5 KB Created: 2021-07-21 00:27:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 677f15cf199b08c2882b46de393c8e41 SHA-1: d61a7800ad46a5841e073bb31c35b2bf3b3381f6 SHA-256: 8cb4cace4e0cd24f46a6dbfcd3eecf1ed4f1b4e1c5c4899d0e62f3ec356a80c4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/free-spins-coin-master-blogspot-game-hack. The document body and embedded links use lures related to free game items and hacks to entice users to click these malicious links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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-spins-coin-master-blogspot-game-hack In PDF document text
    • https://www.wildpark-johannismuehle.de/images/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • https://www.wildpark-johannismuehle.de/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.wildpark-johannismuehle.de/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • https://www.wildpark-johannismuehle.de/images/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.wildpark-johannismuehle.de/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • https://www.wildpark-johannismuehle.de/images/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://www.wildpark-johannismuehle.de/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://www.wildpark-johannismuehle.de/images/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://www.wildpark-johannismuehle.de/images/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • https://www.wildpark-johannismuehle.de/images/promo-codes-for-free-robux_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_off00002f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F9E 23320 bytes
SHA-256: 07eb6ba760c659407a109ee9b28dd4b38b15044179294090e6515994042fb38a
font_01_sfnt_off00006450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6450 18464 bytes
SHA-256: 1c6dfc1f98a6641c171a543c2046344b7d819ff3e085ab3ae56c0ac3320f4f50