Malicious PDF — malware analysis report

Static analysis result for SHA-256 3319386760d4c159…

MALICIOUS

PDF

40.2 KB Created: 2020-08-30 19:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26e84f2a4baed68764aac566095ecaa5 SHA-1: 0ee4e27ee880532c2824199c011db84c76ef9b58 SHA-256: 3319386760d4c1596cc54efdfdc055d69b794d3bd62ce9bfa345e044f0858d17
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, characteristic of a link farm. One of these links, 'https://ttraff.ru/wix?keyword=what+to+listen+for+in+music+copland+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector URL is the primary indicator of compromise.

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=what+to+listen+for+in+music+copland+pdf
    • https://static.usrfiles.com/ugd/b8c837_36ab2292abc746c7bd03bf81886881ef.pdf
    • https://static.usrfiles.com/ugd/30e015_95954372c56941f1ac838503fbc9ea63.pdf
    • https://static.usrfiles.com/ugd/6cf392_7551cdc644264e94ab690399fc202e56.pdf
    • https://cdn.shopify.com/s/files/1/0438/8143/1195/files/arkham_knight_all_riddle_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/2347/3568/files/30505071486.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/ayodhya_kand_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/1656/6422/files/72659983117.pdf
    • https://static.usrfiles.com/ugd/eb4c03_712a8de2fc5042c4b9da30242dc119cf.pdf
    • https://static.usrfiles.com/ugd/b13fd1_5655add06da0477fa37f94f0745a579d.pdf
    • https://static.usrfiles.com/ugd/44b221_3d04185d90d641759cd6db6f514e86b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b469bbfbb92b47b990690137d1cb885f.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/44091306100.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/zujobofa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3032/files/wavokiti.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_off00005ebc.bin
ef8b7cbe530282450d883840f7a26877fb17478f553dc05d1d16ec06f0d024e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBC 5408 bytes
font_01_sfnt_off000070fc.bin
104bc4068bea327aec209f4bdb9662df8942e7f3484c735ff3cef21a9332ecd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x70FC 10624 bytes