Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8310df63c3d838a…

MALICIOUS

PDF

47.1 KB Created: 2021-05-19 16:32:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8d6e739e91862d3d809673ff0ed30c60 SHA-1: e7cea6ce66ba2e2c3176cd8bba2a07ff526d79f3 SHA-256: b8310df63c3d838a8fb1333be791e10f3c6dbb239f64a5c6ae1df1056824fc9d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and generators. The primary lure appears to be a Roblox hack generator, which then leads to further malicious PDF files hosted on leechan.cn. The ML classifier also flagged this PDF as malicious, supporting the observed malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/431946152/mobihack-net-roblox-hack-game-hack In PDF document text
    • https://leechan.cn/Public/upload/editorfiles/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/free-spins_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-daily_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/how-to-download-minecraft-windows-10-edition-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
font_00_sfnt_off00004a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A30 29036 bytes
SHA-256: bf6e65d588ca8bbf74a0e2af78e5acd1a5589260fe3088fa227910288ca3987f
font_01_sfnt_off00008a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A9E 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9450 18768 bytes
SHA-256: 4038ce5e3e0945c6cd976405ec29b4e5783f739c83bcd68413f286c6b350b233

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