Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e25c2616f4bdf38…

MALICIOUS

PDF

40.6 KB Created: 2020-08-31 08:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37da8b755140f6f46c90ba6fe7eb91d6 SHA-1: e29a8a66d0df1f7afdc620703b7e94b6eb9692f9 SHA-256: 6e25c2616f4bdf38653d690da7db1af6b2beef81add436ab87b839e7aaabcea8
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, forming a link farm. One of these links, https://ttraff.ru/wix?keyword=biocentrismo+lanza+pdf, points to known malicious redirector infrastructure. The document body and embedded artifacts do not contain executable scripts, but the presence of the malicious redirector and the link farm strongly suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

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=biocentrismo+lanza+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/bozefavopejeson.pdf
    • https://cdn.shopify.com/s/files/1/0440/9786/3832/files/nagetitasisebakilukit.pdf
    • https://cdn.shopify.com/s/files/1/0428/5300/7516/files/browser_apple_safari.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/17721117288.pdf
    • https://static.usrfiles.com/ugd/3b0c81_7c479cc48e37402c90bcf807fd6fe673.pdf
    • https://static.usrfiles.com/ugd/5af86b_5f57c57ef455426baae5230f582e6cc9.pdf
    • https://static.usrfiles.com/ugd/e6092c_6ed803c84a9e476c9df8355b0639a21f.pdf
    • https://static.usrfiles.com/ugd/764aaa_c43dfb169ef44c0eb07f0abf7f573840.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cbaf4432a3240aebeb8cc751c0e4c84.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_off00005eb4.bin
95c9042c50683c36069f04f4b11dec6277f387f5832c4ed1523395ebd31c7060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB4 5400 bytes
font_01_sfnt_off000070f4.bin
f4cf2d64ea623db8e68f33838c9aa79c5506cb2ff9a7800600751fb1a3e47a45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F4 10592 bytes

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