Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86ba123d0b98cdd…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 06:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53265f25b29c6ce8f06933f46664b686 SHA-1: 9c82a52b847f6f4c62481ff78f412462169fe3e8 SHA-256: c86ba123d0b98cdd360d21d6ea6dbb9330f12138f6b5c2a74916f198c97c30ee
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic indicating it links to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text fragments and a URL that align with this finding. The primary attack vector appears to be a lure to a malicious site disguised as a test, leveraging a link farm of other PDFs hosted on Shopify. The embedded URL 'https://ttraff.ru/pify?keyword=ssb+word+association+test+pdf' is the most critical IOC.

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/pify?keyword=ssb+word+association+test+pdf
    • http://files.hamcogardennetwork.org/uploads/1/3/1/8/131856476/dc0d79bce71c8a.pdf
    • http://files.chicagonightlifepass.com/uploads/1/3/1/8/131872087/cc887fb5.pdf
    • http://files.hmbw.co.uk/uploads/1/3/1/4/131453682/3795514dd2fb.pdf
    • https://cdn.shopify.com/s/files/1/0436/0614/7230/files/78569881204.pdf
    • https://cdn.shopify.com/s/files/1/0438/2156/4066/files/68374328292.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9942/files/600529288.pdf
    • https://cdn.shopify.com/s/files/1/0430/3385/4101/files/better_foliage_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/sabuwunidudif.pdf
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/introduction_to_operations_research_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/77565552618.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/dadapukis.pdf
    • https://cdn.shopify.com/s/files/1/0433/3587/6776/files/dezoke.pdf
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/46400889833.pdf
    • https://cdn.shopify.com/s/files/1/0433/0304/3230/files/kuwuxaloruzib.pdf
    • https://cdn.shopify.com/s/files/1/0428/6939/1527/files/nikapibulekazasop.pdf
    • https://cdn.shopify.com/s/files/1/0438/9804/4568/files/rakifus.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/
    • https://cdn.shopify.com/s/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d04.bin
64a091abf4248efd52499a5f88aa86fde663a6a5d01fb1151841a4e832342256		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D04 5452 bytes
font_01_sfnt_off00007fa9.bin
5b9cc806d2401f07c0505c61a616b37f754ee14d530382df4158a0fc9be0a880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA9 10016 bytes

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