Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6f9f33d1f71ce1…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 16:26:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7ea3cbe6fa26df342fefc260dce98370 SHA-1: 322d688be8a3c8f66755e12a6a8a7a4a926aeab3 SHA-256: 2b6f9f33d1f71ce1ccba5e994e976ccaabde9303c11720496ae3318f8257316c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as game hacks and free spins. The heuristic firings indicate that this PDF is designed to lure users to malicious infrastructure. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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-60-spins-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/rbx-free_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/tiktok-viewer-free_GM835599320.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_off00004f3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F3D 26104 bytes
SHA-256: 9bdc55dfc62a4b44801cfb0cbab8606c206d694d5591b2051e5cfaa30dd85fea
font_01_sfnt_off000089ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89AE 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9399 18064 bytes
SHA-256: 2be77c99efee58e2312fff3056c37fdd8f65a42446f1ebfd65b900f20d31ca7c

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