Malicious PDF — malware analysis report

Static analysis result for SHA-256 88070c2d1267dc3f…

MALICIOUS

PDF

32.6 KB Created: 2020-08-31 17:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec3366e43daa9c1fdd46a9b47c9a7d50 SHA-1: af0a58ce461873192426a031ae7ea1dc5e5ca686 SHA-256: 88070c2d1267dc3ff8c6ece302194a3b32fd99e0cb1802196580147ca6e7fca7
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. The presence of the redirector URL suggests an attempt to lure the user to a malicious destination, likely for phishing or malware delivery.

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/wix?keyword=campus+khati+video
    • https://cdn.shopify.com/s/files/1/0447/4303/2983/files/aashto_code.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/sozuzibemokil.pdf
    • https://cdn.shopify.com/s/files/1/0452/3288/1824/files/inadvertent_disclosure_of_privileged_information_cases.pdf
    • https://static.usrfiles.com/ugd/76de1a_133ee70a128640f7b29e5285d916a274.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_39504c184f024d26a46948fe9624f0d6.pdf
    • https://static.usrfiles.com/ugd/f96b02_712ef7e66c3b4d29a4fd96d906cc591c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a422e836c42a4d85b8a812df5422cc6d.pdf
    • https://cdn.shopify.com/s/files/1/0429/1123/6259/files/meeting_agenda_templates.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/bus_9110_orly.pdf
    • https://cdn.shopify.com/s/files/1/0435/4483/8303/files/56537788457.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/78861694930.pdf
    • https://cdn.shopify.com/s/files/1/0438/0786/7037/files/31746632480.pdf
    • https://cdn.shopify.com/s/files/1/0431/9405/6861/files/ontogeny_recapitulates_phylogeny.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/bixixuvomenegadipasub.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_off00004606.bin
1fc2372b269889a288731be297640e737d8c91c421891d790fd70b863b9a0018
pdf-font-stream PDF embedded font (sfnt) at offset 0x4606 5100 bytes
font_01_sfnt_off0000573a.bin
576fda648afa6b847d482a4b3dc1ccb3df0e988afca180a30850655711200754
pdf-font-stream PDF embedded font (sfnt) at offset 0x573A 9072 bytes