Malicious PDF — malware analysis report

Static analysis result for SHA-256 3484a8c802be780f…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 15:13:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4ebb08a6e13dd76205823d4fa4d215c4 SHA-1: 4a3d6f3ef6263ddee65d1dc756058895b854d99a SHA-256: 3484a8c802be780f28cd92d4a2062b248313b272bcd37eb32de56d0d13ded703
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and in-game currency, which are known lures for malicious activity. The heuristic firings indicate that these links point to known malicious redirectors and the ML classifier strongly flagged the document as malicious. While no scripts were explicitly extracted, the embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-hacks-iphone-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/demon-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-coin-master-gift-link_GM406889139.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_004_off00005169.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5169 24632 bytes
SHA-256: c1a4345f6d28db6c9140e8cac6e2dacab4abfb2d13943b2cc24f25ec5a49fcab
font_01_sfnt_off00008a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A59 18060 bytes
SHA-256: 9ccc1d8bd8827427bdd2e576ac4afcbf92768d6c7b4bf1f6dc8c42a95cbbb1c2

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