Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd26b34d268cccf5…

MALICIOUS

PDF

44.4 KB Created: 2020-08-22 13:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05b4b42ed8af3774e5b4e6781739da39 SHA-1: 604c61223bcb9478ef8f4b58ea30125e0df6fbc9 SHA-256: fd26b34d268cccf5c4918b216b55d30db1762e46faf7e8ad5415ced412549f57
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, suggesting an attempt at SEO poisoning to drive traffic to malicious sites. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is further obfuscated by a keyword parameter. The document body, though heavily corrupted, contains the same URL, indicating it's the primary lure. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=basic+knowledge+of+zoology+pdf
    • http://files.fergusonchurch.org/uploads/1/3/2/6/132695194/4c6a7.pdf
    • http://files.kmphotographyma.com/uploads/1/3/1/4/131407165/1126974.pdf
    • http://jaluja.transgresspress.org/uploads/1/3/0/8/130874493/9bc9785b416.pdf
    • http://files.littlesirestaurantandlounge.com/uploads/1/3/0/7/130775398/sogakukosesazijetup.pdf
    • http://roruketox.dihsolutionsllc.com/uploads/1/3/1/8/131872225/nulazamo-xevexurusiwis-zesilavolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5295/6838/files/rodaxis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/76596081974.pdf
    • https://cdn.shopify.com/s/files/1/0432/3852/3047/files/xezaturiletobejewerogij.pdf
    • https://cdn.shopify.com/s/files/1/0434/7048/7712/files/american_english_file_4_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/9307/1774/files/17902646841.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2893/files/97121592673.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/95885651427.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0011/files/xosepamipijo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4507/7660/files/fopobalokuneza.pdf
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/11219785385.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/mufuw.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_off00006b10.bin
1a693e034170643302ae887387575166ffbc73c3bc30ca3a62db647069f18e42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B10 5584 bytes
font_01_sfnt_off00007e4d.bin
135620506739921856c55c0ed5e729f95fa63aa587e736628a04c30d36f5f195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4D 11516 bytes

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