Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8631f89fb53b8b7…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 16:18:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a9ef5d02c700d02f501e53fd187f87c1 SHA-1: a282a69ceedc0e5812fd24d64213cfee71bef0de SHA-256: b8631f89fb53b8b73f19ce0cb19dcf7061902a817e8cb28ade5dfb2a169a939c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' or 'game hacks' for popular games. The primary lure URL is https://netcdn.online/app/406889139/free-coins-coin-master-game-hack, which is part of a known malicious redirector chain. No scripts were extracted, but the document's structure and embedded links strongly indicate a phishing or scam attempt designed to lead users to potentially harmful content.

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/free-coins-coin-master-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/robux-hack-program_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-connection-lost_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/spin-coin_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/spin-coin-master-free_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_off000052db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52DB 25172 bytes
SHA-256: 8282d342c0b9a22eca355427b58f0604f7e417932fd3098debe4e6a8e49297e6
font_01_sfnt_off00008b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8F 17712 bytes
SHA-256: fd51fa1b849cf95139b510f282bcd47e41e352499df1938c7ca947a320e7b070

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