Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35cba6fe4a64dc3…

MALICIOUS

PDF

48.0 KB Created: 2020-08-30 21:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c0d95b282c6fc75fa2c0a13d19a42fe SHA-1: 45cc11329cba087a7a400f1aa388cc1e6764ab8d SHA-256: b35cba6fe4a64dc31ddd6e08c3fe09a1ff2824f2b094404d32cbcf3aaeaf66f2
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=lair+of+darkness+yugioh, which is identified as a malicious redirector. The presence of numerous embedded links, many pointing to shopify.com, suggests a coordinated effort to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=lair+of+darkness+yugioh
    • https://static.usrfiles.com/ugd/b8c837_b41ed9564edc49e481e31d1d9dac9b30.pdf
    • https://static.usrfiles.com/ugd/b8c837_19f89640d3bb44aea2a338c217176e68.pdf
    • https://static.usrfiles.com/ugd/0789d5_c58476c56a9f43fa9c1920b199f63da9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac12d57502c74ed1a228633ad36d55bc.pdf
    • https://static.usrfiles.com/ugd/24853a_571287ab6ceb4578ae83811862f60699.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8333/files/66868421503.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/12_angry_men_sparknotes.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/jamovodapikumaju.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/dogug.pdf
    • https://cdn.shopify.com/s/files/1/0429/0668/1497/files/sajezufum.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/pafemufinonexano.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/10830527032.pdf
    • https://cdn.shopify.com/s/files/1/0447/0574/3004/files/90558748563.pdf
    • https://cdn.shopify.com/s/files/1/0439/0476/2011/files/zowoteniregimi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4515/files/41095402629.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_off00007301.bin
e5a691e8dde9d403604575671cd7deecb24bff11d5b617c2edea61be658e121c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7301 5244 bytes
font_01_sfnt_off000084de.bin
2664555fb63ed5d1229025c4e3fed1968e2397814080a09e26f34135a2568266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84DE 15264 bytes

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