Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43ce4714ccdbde6…

MALICIOUS

PDF

42.2 KB Created: 2020-08-04 06:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e95730631536e8168b6e70910ca6204c SHA-1: c3c338ce42efe5b7d973f70b89c4649771d939e6 SHA-256: c43ce4714ccdbde6cc7be03bbb788133cfac6272c55a97142be900385fb6b130
154 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 a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'North American Free Trade Agreement Certificate of Origin PDF' and the malicious redirector URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=north+american+free+trade+agreement+certificate+of+origin+pdf
    • http://files.llenise.com/uploads/1/3/2/6/132681880/5438677.pdf
    • http://files.stonegategeo.com/uploads/1/3/2/7/132740804/15f6f1f63.pdf
    • http://files.aocmhm.org/uploads/1/3/2/6/132681878/2465d167faa8617.pdf
    • http://files.newleaftherapyassociates.com/uploads/1/3/1/4/131453133/4bf709a44a64f4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/95424145704.pdf
    • https://cdn.shopify.com/s/files/1/0436/3006/7865/files/bagugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7542/files/riboripero.pdf
    • https://cdn.shopify.com/s/files/1/0436/2207/2480/files/rewutevofofapi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/nunotewuroneligarimuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/5959/3894/files/xodetewijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7278/files/muxemofi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2230/9786/files/1470804561.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4309/files/jadoxonevuked.pdf
    • https://cdn.shopify.com/s/files/1/0433/5606/1850/files/saledasubuledi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/30621747920.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/wegipa.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_off0000661c.bin
21a7b87c482920e686007b744eb82297bc05978fe1b26be89329193cc3ba8301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661C 5328 bytes
font_01_sfnt_off0000781e.bin
775a32b0f81896f03125789ebc7149c8871141b367a71d5357a9478ca49d5eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781E 10180 bytes

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