Malicious PDF — malware analysis report

Static analysis result for SHA-256 235b39b4e488b14f…

MALICIOUS

PDF

53.9 KB Created: 2020-07-27 09:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 629951ffadb47f96df4dbe5c0e3316d0 SHA-1: fc2afcb3a307a99da932fc649fd131b77bfd25ab SHA-256: 235b39b4e488b14fe4ec9b366160b053dca6f259fd710b8df53046a3ceaba2ac
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of an SEO poisoning or link farm attack. One of the primary links directs to 'ttraff.ru', identified as a malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

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=distance+and+displacement+lab+answers
    • http://files.wellpetanimalhospital.com/uploads/1/3/1/8/131856374/7271171.pdf
    • http://files.mrg-skyline.com/uploads/1/3/0/8/130813855/745163.pdf
    • http://files.cafebuzzzbeans.com/uploads/1/3/1/3/131383921/wufiriluzujuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/1028/5990/files/rowanipav.pdf
    • https://cdn.shopify.com/s/files/1/0435/7039/7352/files/36256854457.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/79690085907.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7500/files/53607884392.pdf
    • https://cdn.shopify.com/s/files/1/0434/8801/8594/files/29905331527.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/17233976072.pdf
    • https://cdn.shopify.com/s/files/1/0437/1048/0537/files/27372305906.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/jenekubukafuwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7617/3472/files/73561831764.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/vakenavesofuwawufix.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/65957654920.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7578/files/fagezejojoxanusot.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/jokesegiratotefubimadiwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/37177036896.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_off000096c5.bin
12610c4300db4e2758bb7466dd0e408124ae4f4fa32fffbbe1dc5e8c21646a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96C5 5128 bytes
font_01_sfnt_off0000a817.bin
3c795f6ce054a03a47e15e925823c8dfc4fc7af0ff7563d5463a9d1113f4a1ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA817 9904 bytes

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