Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4de0c00b90b6012…

MALICIOUS

PDF

44.9 KB Created: 2020-07-30 17:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d83ab49e04291963275044c7dcec7a1 SHA-1: 7619d0931580aa745aa1a9bfdd2220913338ffe5 SHA-256: c4de0c00b90b6012369c6d4373d0c0e15aa7426890f7bc1c75ff7d26b9b42ccb
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm. Another critical heuristic, PDF_MALICIOUS_REDIRECTOR_LINK, flags a link to ttraff.ru, which is known malicious infrastructure. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to contain text related to 'internal auditing', likely a lure.

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=definition+of+internal+auditing+pdf
    • http://files.bolstersunderway.com/uploads/1/3/1/4/131406592/sutab.pdf
    • http://files.christierecords.in/uploads/1/3/1/0/131070483/2715171.pdf
    • http://files.chrisgriffithdesigns.com/uploads/1/3/1/0/131070098/6625889.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/lakesodomisuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/25040641280.pdf
    • https://cdn.shopify.com/s/files/1/0429/2011/6380/files/sisivixiduwavewavumelez.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/xagobutano.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/60941292454.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/34382067127.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/89677405488.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/23623487725.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/zulexinoxidaweko.pdf
    • https://cdn.shopify.com/s/files/1/0431/9939/8052/files/zefotobivago.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/womixaxeferez.pdf
    • https://cdn.shopify.com/s/files/1/0432/6408/2073/files/marufokukudaxakijipisop.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_off00007386.bin
9d2a0dff5f47a177b9b8e441cb64a011a73861faf58ff9b417a02ebdf5897fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7386 4912 bytes
font_01_sfnt_off00008446.bin
a82e42d3efc3b06cda5965026bf8b7890cf9b31952b6eb725a7c7c67a24c4e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8446 10052 bytes

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