Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b051b1fd65aa094…

MALICIOUS

PDF

46.3 KB Created: 2021-05-11 00:09:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3f72cae4d3ff76c6d80ffdc55262fb2b SHA-1: dbf4cd81473379274f71efedf9abf9cdf8c24880 SHA-256: 6b051b1fd65aa0946f02fef2f24251ee44f3527308ab4ac8920dc4d04068791f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to external resources related to game hacks and free virtual currency, suggesting a lure for potentially unwanted or malicious downloads. The presence of a PDF_SEO_LINK_FARM heuristic indicates a large number of such links were generated. While no scripts were explicitly extracted, the document's structure and embedded URLs strongly suggest an attempt to redirect users to malicious content, likely via a T1059.007 (JavaScript) exploit within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9278

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/free-spin-coin-master-link-download-game-hack
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/how-to-get-free-robux-for-free_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/how-to-get-free-robux-hack_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/www-coinmaster-com_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-daily-free-spins-and-coins-link_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/minecraft-world-free-download_GM479516143.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-roblox-executor_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-ways-to-get-robux_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-robux-apk_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-spin-pattern_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-robux-obby_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/how-to-generate-free-coin-master-spin_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/2021-roblox_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-invite-friends-hack_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-spins-for-coin-master_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-texture-packs-for-minecraft-pe_GM479516143.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/games-to-get-free-robux_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b45.bin
df74af3046f433fd691a1448e6f9fd6a1c643dd4a28c27afa7df0766e1230736		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B45 25820 bytes
font_01_sfnt_off00008630.bin
4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8630 3400 bytes
font_02_sfnt_off0000915a.bin
136b79965a5248ac6e7935dc786215b4277752963c3c0798ae07969220183c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x915A 18636 bytes

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