Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcaa828956d5757…

MALICIOUS

PDF

40.6 KB Created: 2020-06-19 20:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c4d4439e817c714dfc8f3cb8c72450c SHA-1: d1af657eeab0d3f078f321f87c58e801eb87a922 SHA-256: dbcaa828956d57570b2e358db9144bf85df34854fe5a5e3692037deb22367800
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The document body, though partially corrupted, suggests a lure related to 'States and their capitals in India PDF', but the primary function appears to be redirecting users to numerous other PDF files hosted on various domains. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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 http://mta-sts.school-alliance.com/uploads/1/3/0/4/130489650/130489650.html#states+and+their+capitals+in+india+pdf
    • http://ns38.ezexs.com/uploads/1/3/1/4/131437839/df1ee6e55.pdf
    • http://bisoninvestmentconsulting.ca/uploads/1/3/1/8/131856326/3395131.pdf
    • http://webdisk.c3power.org/uploads/1/3/0/5/130542909/nededudodusofun.pdf
    • http://webdisk.casavaqueros.com/uploads/1/3/0/5/130588622/8793468.pdf
    • http://christiansoundsandpictures.com/uploads/1/3/1/4/131408241/fobiwe.pdf
    • http://hotchiwitchi.com/uploads/1/3/1/8/131856108/bopako.pdf
    • http://permanentcosmeticartsetc.com/uploads/1/3/1/4/131408502/d1c14f1c156e56.pdf
    • http://swedeshop.net/uploads/1/3/0/3/130313459/331694.pdf
    • http://ftp2.custom-mfg-eng.com/uploads/1/3/0/7/130775854/kebalejipunokej.pdf
    • http://faroutpaints.org/uploads/1/3/1/3/131380342/9371430.pdf
    • http://jobsight365.com/uploads/1/3/0/5/130588452/mitader-setuzi-sukapamoduji-pewuduwegedaked.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e3.bin
c8057ccaf2de48be63dc6fc5381fa059431e73d7c2f5df4e113513b667072091		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E3 5024 bytes
font_01_sfnt_off000071d7.bin
30639ae2893566b4f617d96bd44f3d198f796ca227f594b840e339763b0bf0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D7 10644 bytes

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