Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b87f5487394d1dc…

MALICIOUS

PDF

50.5 KB Created: 2020-08-31 00:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 939e74ea4b240a1e763f1cc3b6350628 SHA-1: 4fd393d47735be12e874ad1fac78eb1e1c2dca8f SHA-256: 8b87f5487394d1dcec6bbe7a87d49a94f93fd4a486b7da72c976c84ba3585bfa
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a link farm designed to attract search engine traffic. One of the embedded links, specifically 'https://ttraff.club/wix?keyword=button+mushroom+farming+in+zimbabwe+pdf', is known to lead to malicious redirector infrastructure. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document but rather a lure for SEO manipulation.

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.club/wix?keyword=button+mushroom+farming+in+zimbabwe+pdf
    • https://cdn.shopify.com/s/files/1/0452/8275/4722/files/spotify_app_apple.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/hosting_a_website_on_github.pdf
    • https://cdn.shopify.com/s/files/1/0437/7395/2158/files/bikini_body_guide_help_nutrition.pdf
    • https://static.usrfiles.com/ugd/173616_1cc01513c5514a7ab7dedb4ea12fb5b5.pdf
    • https://static.usrfiles.com/ugd/26481d_dd94278cc5de483180c4ca5910c3849d.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/factoring_quadratics_algebra_1_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/xafufaladerorifulid.pdf
    • https://cdn.shopify.com/s/files/1/0460/2216/4639/files/stylesheet_react_native_cheat_sheet.pdf
    • https://static.usrfiles.com/ugd/111c46_27446d07b5ac4693b042fc8c30f1f0ec.pdf
    • https://static.usrfiles.com/ugd/1c90dc_dc44de3a44574d8497bddfeeb057a50c.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_off000084d4.bin
35737ec0bf1ae6cd423709bef1ef08bccc864dfc69f4e0f5f0908b16d1c42110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D4 5756 bytes
font_01_sfnt_off0000984e.bin
ca76960538f7be3015116335ea1516f34789d0548ec0fbe4818efcca378296ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x984E 10744 bytes

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