Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d463a9dee2c8ad2…

MALICIOUS

PDF

36.3 KB Created: 2020-08-31 07:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93bf7a082ec1075e7bd18fdcbed896f2 SHA-1: 5c8c391d0e3beac7739fac061ba503192e1b9474 SHA-256: 6d463a9dee2c8ad2cd3ca65a312aaaf4024d3b7e828d09cfdce6303380852b0b
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently leading to a malicious redirector URL disguised as a car manual. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document body and malicious URLs.

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.cc/wix?keyword=chevy+cruze+2014+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4340/4441/files/73509628841.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9385/files/jazafizabadowunutajinukeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/1374/1471/files/escape_room_mystery_word_level_203_answer.pdf
    • https://cdn.shopify.com/s/files/1/0436/9186/8310/files/81759700539.pdf
    • https://cdn.shopify.com/s/files/1/0431/7760/7324/files/milifofimen.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/59196578163.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/fundamental_electrical_troubleshooting_dan_sullivan.pdf
    • https://cdn.shopify.com/s/files/1/0447/3962/5111/files/hard_candy_manufacturing_process.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2115/files/8670682217.pdf
    • https://cdn.shopify.com/s/files/1/0436/8223/4521/files/malayalam_old_movies_link.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_off00004989.bin
8967afb768d1a7fd72579ae263ea68374f815f22ee3bdc4c10349bd9f81b4548
pdf-font-stream PDF embedded font (sfnt) at offset 0x4989 5392 bytes
font_01_sfnt_off00005bd9.bin
e2fedfa7659ca5fd929d785a205ad48297aef5f4626e0dc8edbfa1a0afb5eb96
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD9 12844 bytes