Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72591e145705fa1…

MALICIOUS

PDF

37.9 KB Created: 2020-08-19 14:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ec2d49c7d331b208511e1f972104865 SHA-1: 70dd09737ad53fb74f54d926c9cb1c29d2d340f3 SHA-256: c72591e145705fa1ba56309bda8112f3dc3c3fd63452e4c36952116a79c4ab51
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or redirection tactic to obscure the final malicious destination. The document body, though heavily obfuscated, contains the text 'Virginia apostille form' and the malicious URL, indicating a lure to trick users into clicking the link. The ML classifier strongly supports the malicious nature of this PDF.

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=virginia+apostille+form
    • http://xujore.jawanatravel.com/uploads/1/3/0/9/130969352/vubitijosonaro-wawizixegu.pdf
    • http://files.sompbags.com/uploads/1/3/0/7/130740199/8677019.pdf
    • http://files.mariozaragoza.net/uploads/1/3/1/3/131384468/81722f61a65fb0a.pdf
    • http://bofefuv.jacquevilmainmusic.com/uploads/1/3/1/4/131453536/2648568.pdf
    • https://cdn.shopify.com/s/files/1/0429/1677/4054/files/ziduvokimogetuxelaga.pdf
    • https://cdn.shopify.com/s/files/1/0436/2141/7123/files/88874107195.pdf
    • https://cdn.shopify.com/s/files/1/0435/5227/6632/files/zanugaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/pitegemepuvalo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6103/2598/files/kevixulire.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8244/files/10737611895.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/rotapetajawanufenupev.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/xupiwimirifufanupim.pdf
    • https://cdn.shopify.com/s/files/1/0435/4870/4920/files/godufatigakoxakipad.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_off000055d0.bin
547ab7e33b7f4d90e6b7359f2ed17aaa5c868ddaf043cce051b27e81cafca90c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55D0 5188 bytes
font_01_sfnt_off00006760.bin
0f84d1d341bad4c8468fca1ef4ed7f2bef9be8aac17e087b14429e2b8e44532a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6760 10552 bytes

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