Malicious PDF — malware analysis report

Static analysis result for SHA-256 764a731695314753…

MALICIOUS

PDF

34.2 KB Created: 2020-08-31 09:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f2598a337116007fbb211137c854c78 SHA-1: 9f015139c13ff2275e8886ed8b5c3e5ccd733247 SHA-256: 764a731695314753482a3f6a68c896525390bde06acfe702fc627d86890be6e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link to a known malicious redirector infrastructure, disguised as a driver download. It also features a large number of external links, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or malware distribution campaign.

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=dell+driver+dw375+bluetooth+module
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b50c55_3abfb46abe704221a300a22d352ccc0c.pdf
    • https://static.usrfiles.com/ugd/432b07_647c79d2badd4e4fbe144732a9aa31a2.pdf
    • https://static.usrfiles.com/ugd/64f9d2_cbcaa8ab9a134cbabd3f174bf6d367a3.pdf
    • https://static.usrfiles.com/ugd/76de1a_395376929be84ea7b8cde7e26b72e558.pdf
    • https://static.usrfiles.com/ugd/2ddd39_9de38fd850dc4ffe97328434fd945528.pdf
    • https://static.usrfiles.com/ugd/d5415a_fb92b0a20f034226875daff7c5fb49e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_8df052a8eff54f639f43a71e5b786c04.pdf
    • https://static.usrfiles.com/ugd/ddb60a_aaa98c5d94bc488eb20237e8dbdbffeb.pdf
    • https://static.usrfiles.com/ugd/76de1a_34f1225c26cd4950ad65f3764719b057.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/dizorurikokeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/organic_chemistry_john_mcmurry.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/design_brief_pltw_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/2980/6759/files/dotiladogeposumodagolezi.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_off00004862.bin
0e33821e533ca16003094328ee1f03077aaf93d942d6c6ee055a0fff58fc370c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4862 5336 bytes
font_01_sfnt_off00005a84.bin
79f25e766de2e5d262d34348b2e8917ada864dafa712fce0a1d2a956ac34ddd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A84 9868 bytes