Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4d054be65b49f8…

MALICIOUS

PDF

36.5 KB Created: 2020-09-16 19:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0323ed63b16d02bf83deec488874db97 SHA-1: b86d785ad57505fb4e660e7204ead6cfbce02050 SHA-256: 7c4d054be65b49f8e37cb8efb6c7c30d3fbe619a42d99b621c3a5a6139e5bb54
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves leveraging these links for malicious redirection or to host further malicious content.

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.link/wix?keyword=rainsford%2527s+by+design
    • http://rorexaw.dixielandbandorlando.com/uploads/1/3/0/8/130874493/1452570.pdf
    • http://files.tampalandscapedesign.com/uploads/1/3/1/4/131454355/5050ed.pdf
    • http://files.fortytwomotorsports.com/uploads/1/3/1/6/131607063/mevudafidipev.pdf
    • https://cdn.shopify.com/s/files/1/0431/5932/2778/files/xulejokivivanonejup.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/fikuguvoluradagowofarevi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/tata_bye_bye_video.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9058/files/crossword_answer_for_flat_metal_ring.pdf
    • https://cdn.shopify.com/s/files/1/0438/1461/7250/files/25505839510.pdf
    • https://cdn.shopify.com/s/files/1/0437/9456/3229/files/tonuwewebaluvexat.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/lejajokimu.pdf
    • https://cdn.shopify.com/s/files/1/0447/0777/4618/files/c_linked_list.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_off00005091.bin
bd8c8c5ae176c178139c6beee0826eb6cedec7bd2ec66c338fb3abe185608a05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5091 5324 bytes
font_01_sfnt_off000062d4.bin
bca4b1b89c48e370421fc90bad78dc11c2f8001ae37d566f624d386858624471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D4 10220 bytes

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