Malicious PDF — malware analysis report

Static analysis result for SHA-256 24307bb690ddbbd1…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 16:39:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dc0e8a862d8081d3c05542004564e6bb SHA-1: 44a87b6e2e9d7e61f8c414a5bc9764333ac78596 SHA-256: 24307bb690ddbbd1f1734c8162f8a789d40686bc20bdbe8784368c74927d3557
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary malicious URL identified is https://netcdn.online/app/406889139/sites-for-free-spins-for-coin-master-game-hack. This indicates a phishing or scam attempt designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/sites-for-free-spins-for-coin-master-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/earn-robux-online_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/pubg-uc-top-up-center_GM1330123889.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-army-free-robux_GM431946152.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/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/real-minecraft-for-free_GM479516143.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_004_off0000515d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x515D 26292 bytes
SHA-256: cb55e6bba294a563edeb5d8af189509f2367c52bfdc76f96444d5af8fddaed66
font_01_sfnt_off00008c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8F 3264 bytes
SHA-256: 2756f1aee481866e7be68ea9759d1a1529e56124c339b6d6ce98461e9bcfc10d
font_02_sfnt_off000097da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97DA 17884 bytes
SHA-256: 91ca8f62c0979a078180dc6a81f20f20b88a175a519d6a4650188b448ff1f25f

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