Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe47213f4b973c24…

MALICIOUS

PDF

48.0 KB Created: 2020-08-13 08:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00453a599e6de0cc72783738b88cf7ba SHA-1: c694ebda42c7e056ead9778c43f23b165c2d976c SHA-256: fe47213f4b973c2445d8b10ae5a82b655c4268f3821486618099869e56d0d44f
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, likely for SEO poisoning. One critical heuristic identified a direct link to a known malicious redirector, ttraff.cc, which is presented to the user as 'dilation and scale factor worksheet answers'. This suggests the document's primary purpose is to trick the user into visiting the malicious URL. No scripts were extracted from this sample.

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.cc/wb?keyword=dilation%20and%20scale%20factor%20worksheet%20answers
    • http://files.latvsff.org/uploads/1/3/2/6/132696558/josovawosewaduw.pdf
    • http://bofuji.tehyadiamond.com/uploads/1/3/0/9/130968973/zowugorajuvexasera.pdf
    • http://linudu.krutschworks.com/uploads/1/3/1/4/131407067/disuxoni-labolugawamuguz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7157/0069/files/pifanuzupavujolikexuson.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/pofizarelifoxutedofuzela.pdf
    • https://cdn.shopify.com/s/files/1/0428/1820/7911/files/brown_apron_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/dexos.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/76098682524.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/tidukorudi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8741/0840/files/62283614151.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/real_mathematical_analysis_pugh_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/6413/8651/files/t-_mo._co_paperless.pdf
    • https://cdn.shopify.com/s/files/1/0437/7244/4823/files/91245977150.pdf
    • https://cdn.shopify.com/s/files/1/0440/0083/7782/files/nujovu.pdf
    • https://cdn.shopify.com/s/files/1/0452/5893/2381/files/putidogitero.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_off00007bb0.bin
18fd7602fb0a8032f65b1cf0edbfff89a6b696d2f7607d7f018dd130682fcce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB0 5264 bytes
font_01_sfnt_off00008da3.bin
0e1f411668ad025bd6fa2a6db12c09993cd90a43b2e74a26650f7b1491971b59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA3 11000 bytes

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