Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a5e78bb89e48f0…

MALICIOUS

PDF

42.6 KB Created: 2020-08-30 12:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86491d196405ed010a5491c9bc405b8c SHA-1: 9f21bc0374eaac743ad151aeb0588ef2ae1efac3 SHA-256: c9a5e78bb89e48f00cf3a7431048f3eb40b67f5a8ec47245018234aa4dde874a
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 the presence of numerous embedded links. One critical heuristic firing indicates a PDF link to known malicious redirector infrastructure, specifically 'https://ttraff.com/wix?keyword=normas+sociales+autonomas'. Another critical heuristic identified a PDF link farm, with many links pointing to 'static.usrfiles.com'. The document body, though heavily obfuscated, also contains these URLs, suggesting an attempt to lure users to external sites.

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=normas+sociales+autonomas
    • https://static.usrfiles.com/ugd/0047a4_d220447663a044bdbd60774194e46f48.pdf
    • https://static.usrfiles.com/ugd/b8c837_e847a8f80fd549a3a5b5a5386cd21c87.pdf
    • https://static.usrfiles.com/ugd/d162e3_3ca6bbc718ad408a9c3361b16f5de4f0.pdf
    • https://static.usrfiles.com/ugd/dad90e_fcd6336abe2548b791569cd5009827eb.pdf
    • https://static.usrfiles.com/ugd/0779a3_addbbf67bfe1486ab0436066dc5ccc80.pdf
    • https://cdn.shopify.com/s/files/1/0432/2767/6829/files/1979920406.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/damifinovivesulididitug.pdf
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/factoring_polynomials_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3703/files/ruwere.pdf
    • https://cdn.shopify.com/s/files/1/0445/5114/3588/files/pastest_mrcpch.pdf
    • https://static.usrfiles.com/ugd/8127dd_4648e6b1e1ba4d84817a5b22bafd16f0.pdf
    • https://static.usrfiles.com/ugd/b56239_8fdbedcdaf994e3c94489564a6a28b07.pdf
    • https://static.usrfiles.com/ugd/b8c837_1314c5e26b3f4a2b8d6559bc7f3751e8.pdf
    • https://static.usrfiles.com/ugd/7f929b_70e8a0a7505d4530a16515155a0f06f3.pdf
    • https://static.usrfiles.com/ugd/99afdc_3ee523e4f07148d38db36e9963e5737d.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_off00006a37.bin
866ecebfa38b2fb9fb6f78942683bbabfe6efb0c08f15bbcc0f39662de0bc954		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A37 4916 bytes
font_01_sfnt_off00007acf.bin
d7940ccea5e450dc330a9adb7d80b55f4e079e28e411d3722a3db822d3a9fed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACF 10872 bytes

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