Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3a19d4882acd92…

MALICIOUS

PDF

40.1 KB Created: 2020-08-31 02:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cf826ec4e4e0b38a58cdf9204efec30 SHA-1: 2d69b71d5c87445a0ea8dc913c8f4fb6a2571abd SHA-256: 1f3a19d4882acd928d1e208dfbbe84394506865b69dafd596953c79d39fc018b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/wix?keyword=hp+psc+1610+all+in+one+printer', is flagged as a known malicious redirector. The presence of a link farm and a malicious redirector strongly suggests an attempt to lure users to malicious sites. The ML classifier also flagged this PDF with high confidence.

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=hp+psc+1610+all+in+one+printer
    • https://cdn.shopify.com/s/files/1/0431/7236/4437/files/zimumulegogifodolevene.pdf
    • https://cdn.shopify.com/s/files/1/0436/7217/4745/files/free_suretyship_agreement_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/wuvuxane.pdf
    • https://static.usrfiles.com/ugd/6c98bc_55c8e10a30ea48918865dc96f427e3a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1f77c90893a4412aaa3473ad3b14f38.pdf
    • https://static.usrfiles.com/ugd/df73ab_981607e7b0164a7abd8eae4312917586.pdf
    • https://static.usrfiles.com/ugd/2c8d66_72e4559ff91b495dbdb157c23fcd5860.pdf
    • https://static.usrfiles.com/ugd/b0b521_d3eae71a08e848a1aeede19c528ee827.pdf
    • https://static.usrfiles.com/ugd/45fd81_9cdca97eb5c6461b80e3e1c92cc0bb9a.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_off00005f5e.bin
ec69b47160dc94c8ed3e63bf4c64c4a8d19ef9ff168c0d87b65ed2c94662b976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5E 5236 bytes
font_01_sfnt_off0000712e.bin
ce04f137050d9117991a4e82f0df35b069ce0def03a0466ced238557729033bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712E 10212 bytes

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