Malicious PDF — malware analysis report

Static analysis result for SHA-256 2379d0ba9ea9da04…

MALICIOUS

PDF

37.2 KB Created: 2020-08-29 11:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5927d1d3dfa6af091b62cd683270d3e8 SHA-1: 086485ba32b9431e35f8acd4062be3a17e4c31c4 SHA-256: 2379d0ba9ea9da0488017a55e5d32b63f1f32c844da35ef01e4be30e7d02fbcf
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=singer+one+user+manual'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links, with the primary one being to a Shopify-hosted PDF. The document body, though partially corrupted, contains text related to a 'Singer one user manual' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The embedded link farm likely serves to obscure the true malicious destination and potentially improve search engine ranking for malicious content.

Heuristics 3

  • 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.
  • 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=singer+one+user+manual
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/51967315033.pdf
    • https://cdn.shopify.com/s/files/1/0432/2535/0306/files/75453597588.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/zodepuwefidiruzilibig.pdf
    • https://cdn.shopify.com/s/files/1/0437/4449/3720/files/67173635225.pdf
    • https://static.usrfiles.com/ugd/b8c837_018c0f3770224496953b0396ff042ee8.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bde1bf4d48645b9821b20ead62ea58b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f035972904dc4f688e7143e1609cbd03.pdf
    • https://static.usrfiles.com/ugd/b8c837_96909f32a42a41c2bac533be2f74c901.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0968/files/brand_name_and_generic_name_of_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6249/files/creative_thinking_questions_with_answers.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd17f8a3385d460f9024152796aec39e.pdf
    • https://static.usrfiles.com/ugd/c3548c_344cf371848b4acd9401657388ebc763.pdf
    • https://static.usrfiles.com/ugd/b8c837_47b01ea49aa74de1afedc2d82526b3a0.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_off00004da8.bin
d1de9b62ca30b34fda89fb7f2538b92a15b46f9c69d275bb479eac244444dcbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA8 5108 bytes
font_01_sfnt_off00005ee9.bin
7a54ba14ef1ff16a17f9c837c6edc5e2038b3405d3170b64c08554379ac3401d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE9 12988 bytes

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