Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d3284fa0ebd36a…

MALICIOUS

PDF

41.3 KB Created: 2020-09-02 14:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e9321c8470f3f7912eed8a1352512ef SHA-1: 3e4b53e5dde142cf2c38ee212fe73b953b6aa177 SHA-256: 11d3284fa0ebd36a0857f126c0c12c0b5d3a2af49bf4c3bce4cec45061cdfb8f
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/wix?keyword=best+4k+video+er+free', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to direct users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious.

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=best+4k+video+er+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/32798214951.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/losuvovitepenitajiluf.pdf
    • https://cdn.shopify.com/s/files/1/0449/6785/4248/files/history_of_english_literature_short_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/65992568543.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/35235497445.pdf
    • https://cdn.shopify.com/s/files/1/0436/3082/1529/files/juduxanavanijuvorugorer.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3935/files/fesokasuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/denopugulolejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0942/5056/files/65647020250.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/37781635117.pdf
    • https://static.usrfiles.com/ugd/6924eb_bff59f0c7d1f4723b6a6752b854abb43.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4f5f3787226410ea63105508b12721c.pdf
    • https://static.usrfiles.com/ugd/3c9ac1_4df0366609454ce79866abb6e6d45dee.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_ec19773e49fd47849eb80a83d4ce06ee.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_off00006449.bin
ca98621e94d5f44c8dc3105e648b88023ff8643d86f155975bea25c910a05651
pdf-font-stream PDF embedded font (sfnt) at offset 0x6449 4920 bytes
font_01_sfnt_off00007529.bin
dbdfc4f220e93fed7358e621cad6dcbc119e78ac390805c39c2e1452998e9837
pdf-font-stream PDF embedded font (sfnt) at offset 0x7529 10320 bytes