Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecbadf5e321515f…

MALICIOUS

PDF

34.1 KB Created: 2021-07-08 00:18:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7fc984fe6b9a8f0fc2934554a6caec5f SHA-1: 04387fbbc429253cb6ad958331ef192955f0702d SHA-256: 4ecbadf5e321515fc322400c2c44151254ee66a360e206aaf9bbbd30802acc7e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to a known malicious domain, masquerading as game hacks and free currency generators. The ML classifier and specific PDF heuristics strongly indicate malicious intent, likely to lead users to potentially harmful websites or further malware downloads. No scripts were extracted, but the document's structure and embedded URLs are sufficient to determine its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-spins-in-coin-master-2021-game-hack In PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/robux-generator_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-free-400-spin-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
font_00_sfnt_off000030a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A4 22164 bytes
SHA-256: c4f2d40906dc4950947886a8879b1521f3fc1246ae0b5d56a6c86ac3f175efd9
font_01_sfnt_off00006198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6198 18576 bytes
SHA-256: 1034dc36f239ec6dc0d9d186dded4737358004ec486553186470269d836e9c58

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