Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43db5290a29e2be…

MALICIOUS

PDF

42.4 KB Created: 2020-09-01 08:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 853510e64fd09b9bca99fbe64e1ea475 SHA-1: 68a311fd454ea89d799328ebc23a54e454aad6a2 SHA-256: b43db5290a29e2be9d195cecf5fd5293f6cbbfaf17231a38ded10a7c10288c94
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The document body, though heavily corrupted, contains a URL that appears to be a lure for a game guide. This, combined with the PDF_SEO_LINK_FARM heuristic, suggests a campaign distributing malicious links disguised as content. The primary IOC is the malicious redirector URL.

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=warframe+limbo+guide
    • https://cdn.shopify.com/s/files/1/0433/8312/8214/files/76472297223.pdf
    • https://cdn.shopify.com/s/files/1/0434/3837/5074/files/thirsty_crow_story_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.pdf
    • https://static.usrfiles.com/ugd/5b604d_2a7fa3e9cb264c42bd1e9b326bb3b371.pdf
    • https://static.usrfiles.com/ugd/b5472a_caf8c2b40e51462996205ecb456ae117.pdf
    • https://static.usrfiles.com/ugd/a1fb72_8bf8863779c84e2ba05b0cbf4c75b422.pdf
    • https://static.usrfiles.com/ugd/ea2f88_5bf1fe1167314670ad5c6a18a7f7575e.pdf
    • https://static.usrfiles.com/ugd/78c764_746206342e2649c8bd482c80937635d7.pdf
    • https://static.usrfiles.com/ugd/3aca14_e859cbbba65d41cfad29c4188725d586.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_42a8016d693149529617d432b7a5d418.pdf
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/excel_multiple_regression_analysis_and_forecasting_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0432/2852/8799/files/febegitef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85583151980.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_off0000680e.bin
8a4877ef86199eb86e5a97c485943b8416bb9fbfe297e943d54c8e00fe2d3e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680E 5204 bytes
font_01_sfnt_off000079ba.bin
d37927d554596b2676b4d79bd71e881e4c48749ccd1da9d4f300419f7cf7aabc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79BA 10352 bytes

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