Malicious PDF — malware analysis report

Static analysis result for SHA-256 43151ec6463163bc…

MALICIOUS

PDF

36.6 KB Created: 2020-04-08 11:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b22d3b4da794a64863263d7854bb44b3 SHA-1: d2e18b1f77d875b8fd9863b081729c8e14a432c1 SHA-256: 43151ec6463163bc2a697eb7249582ba8f90cd3268b4ddf1dee1b92b3855e66c
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are dynamically generated and point to PDF files. The primary link in the document body, 'http://mxr4good.com/uploads/1/3/0/6/130603827/130603827.html#4+pics+one+word+level+371+answer', suggests a lure for a game or puzzle, which is a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, further supporting the malicious intent. No scripts were extracted from this sample.

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://mxr4good.com/uploads/1/3/0/6/130603827/130603827.html#4+pics+one+word+level+371+answer
    • http://cookiesporfavor.com/uploads/1/3/0/6/130604748/0464a0f345553.pdf
    • http://ldsstorytime.com/uploads/1/3/0/4/130477468/kopola.pdf
    • http://nbtatco.com/uploads/1/3/1/3/131379530/4247994.pdf
    • http://adsl-63-204-18-59.benefitplans.org/uploads/1/3/0/7/130739509/jokukibudota_sapijivos_vezitexa_somisilugeluvu.pdf
    • http://abcc-am.org/uploads/1/3/0/2/130270904/korupazopipes.pdf
    • http://gdouglastimberhaulage.com/uploads/1/3/0/4/130483368/9fce696dcc82.pdf
    • http://wyliecat30-silkye.com/uploads/1/3/0/7/130740017/feb72d8.pdf
    • http://aacnhillcity.com/uploads/1/3/0/4/130489220/rebajaguruzaduv.pdf
    • http://goredcrest.com/uploads/1/3/0/8/130874648/gutitikumijuro.pdf
    • http://serenitymentalhealthservices.net/uploads/1/3/0/5/130588701/wufovudasotowera.pdf
    • http://undergroundpizza.net/uploads/1/3/0/2/130291561/ab59ac4.pdf
    • http://agentoftaste.com/uploads/1/3/1/0/131070702/d0df3981519191.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000673d.bin
3ef164a18273c185d9984c4f646ccc052f790896da253d24cf96c0b5449cbcae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673D 7328 bytes

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