Malicious PDF — malware analysis report

Static analysis result for SHA-256 773819f601439df8…

MALICIOUS

PDF

36.6 KB Created: 2020-08-30 14:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d387cbd0a6de257be3eddd2a5aff5342 SHA-1: fe6141649987275c116698b0b720388551d87e6b SHA-256: 773819f601439df80e3bbc71b482a650da913169cc0b7f87d4f36bef27e62af1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document, generated by wkhtmltopdf, contains a large number of embedded links, with a significant portion pointing to external PDF files. One specific URL, 'https://ttraff.club/wix?keyword=dutton%2527s+orthopaedic+examination+eva', is flagged as a known malicious redirector. This suggests the document is designed to act as a link farm, potentially leading users to malicious websites through the redirector.

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.club/wix?keyword=dutton%2527s+orthopaedic+examination+eva
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/238140_96f58abf3b8b4e8c84575a999aec11a8.pdf
    • https://static.usrfiles.com/ugd/b910ae_d5ea491c958b4723b1d474a96eb9e170.pdf
    • https://static.usrfiles.com/ugd/db1da1_5fca7950bda14619be6648b4f07e92fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_53aab9d6d5c14b72a94ac2b9ac3f740e.pdf
    • https://static.usrfiles.com/ugd/7f16bd_c7392f39575b4305a324bdddb0fb03dd.pdf
    • https://static.usrfiles.com/ugd/b42fd6_9618decf3a9345d8a5564353c2630e5e.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_709826ee42ae4b6d89b85ecc004fe65e.pdf
    • https://cdn.shopify.com/s/files/1/0464/5240/8488/files/36198422665.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/rereredototojanezuzojuka.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/acca_membership_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0437/2578/3190/files/business_model_you_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/24125254090.pdf
    • https://cdn.shopify.com/s/files/1/0452/0479/9639/files/gosuzikajidiganavofa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051ac.bin
6b958d0dd6d89ade5874ed139f8cd4b2e4c3c31045e6e689258dcceedda0874c
pdf-font-stream PDF embedded font (sfnt) at offset 0x51AC 5440 bytes
font_01_sfnt_off00006413.bin
778a72b63a91e7efd93f1426cabeeba332680b1e54117c18aa9f6af33e05067f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6413 9764 bytes