Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85999d247a1453f…

MALICIOUS

PDF

38.0 KB Created: 2020-07-29 20:39:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d12e79b15e88e92becd8ddfd11d782d SHA-1: bd35d37698c79a72759908a25540c3b8b24abbad SHA-256: f85999d247a1453fd8ac8cc16bcecaf3b1360cd90f4de0521f0317ff22945f05
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external websites, including a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a book title, suggesting a lure to disguise the malicious links. The presence of a malicious redirector link and the link farm heuristic strongly indicate an attempt to direct users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.
  • 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://ttraff.ru/pify?keyword=understanding+pathophysiology+6th+pdf
    • http://files.myececlass-growth.com/uploads/1/3/0/7/130740464/zojejava_dupareja.pdf
    • http://files.christopherhale.net/uploads/1/3/2/8/132814241/lipuvoxagizep.pdf
    • http://files.realblackwolf.com/uploads/1/3/0/7/130775747/garekelusago.pdf
    • http://files.cowaysyahila.com/uploads/1/3/2/7/132740413/talepesegusozelus.pdf
    • http://files.chandlertowingservices.com/uploads/1/3/1/0/131071145/1024254.pdf
    • http://files.chandlertowingservices.com/uplo
    • https://cdn.shopify.com/s/files/1/0429/2670/2758/files/vugegaroforepitedidugoko.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/20380222687.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6298/files/wozexotoki.pdf
    • https://cdn.shopify.com/s/files/1/0440/7607/3125/files/54876672918.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/neviz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3480/4375/files/43501421936.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/18156852108.pdf
    • https://cdn.shopify.com/s/files/1/0429/4216/9244/files/10590837023.pdf
    • https://cdn.shopify.com/s/files/1/0429/3676/2527/files/62045011891.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_off00005575.bin
31e66a4641c811c51c5dfecc6a32ae9ec2c594fc4077f750f500f80c85e2121a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5575 5336 bytes
font_01_sfnt_off00006793.bin
9e8f928a0dac4df7af610c15d4161556adf96cd5ca713fe2cfc842d8c73be72f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6793 9824 bytes

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