Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78db8fe3fb3d8e7…

MALICIOUS

PDF

40.2 KB Created: 2020-09-02 18:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56718cd23a7be862c0bf576fbfa5fa64 SHA-1: 960c58ae1bc90666807e6c141b4c02f32b6faf68 SHA-256: f78db8fe3fb3d8e7bcd0adabde74f8723664da0d62db5aa7a213bfe29cdeb3f3
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'ttraff.com'. Another critical heuristic identified a PDF link farm, suggesting a tactic to manipulate search engine results and drive traffic to potentially malicious content. The document body, though heavily obfuscated, contains references to the redirector URL and several Shopify-hosted PDF files, some of which are confirmed benign but others are part of the link farm.

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.com/wix?keyword=java+8+api+documentation+offline
    • https://cdn.shopify.com/s/files/1/0427/6885/9303/files/doxupes.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7884/files/blogger_template_for_affiliate_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/24660876003.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/46851032731.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/47025331038.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/kilugukovitoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6166/5192/files/95018456145.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2238/files/vscode_format_code_php.pdf
    • https://static.usrfiles.com/ugd/b8c837_e464a8a67a07489fa31bc7d8cdac3a0f.pdf
    • https://static.usrfiles.com/ugd/0dd040_90dfdfc2fb014389b6760fd6b0113b6e.pdf
    • https://static.usrfiles.com/ugd/f65518_2469ad352f214d048fe1bd6215e41976.pdf
    • https://static.usrfiles.com/ugd/b8c837_407fb36b545b451db726156f0a55eebe.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_c7e28db50a994add969340f2ad8f3bcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e49ccab4d2473b92c51524267b7cea.pdf
    • https://static.usrfiles.com/ugd/d54300_f875954285764c42bd76fd2f2d63840f.pdf
    • https://static.usrfiles.com/ugd/0bcf16_452ca27c69674d2fb3678d84e02e1f47.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_off00005eac.bin
523e4f30f4a450d0ee81b76f6bda9c1a295bab7c447f7750d799ad52fcda22c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAC 5268 bytes
font_01_sfnt_off0000709f.bin
f6f4173e95f150a30baa62a8867286f7b86be6a727d6880abbfc4993f67c6b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709F 10372 bytes

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