Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86d5a21418d5f07…

MALICIOUS

PDF

41.6 KB Created: 2020-08-08 18:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf72861eefddecc537883634b8d868d5 SHA-1: 5b7b4f7518ad4085f9a01ae32c2957de0ee4982e SHA-256: a86d5a21418d5f0736e4b734c871bc8478b3da9b9014242def0fa85e5b3d214a
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm. One of these links, https://ttraff.ru/pify?keyword=synonyms+and+antonyms+activity+pdf, is known to redirect to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated.

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/pify?keyword=synonyms+and+antonyms+activity+pdf
    • http://files.craftybrown.com/uploads/1/3/2/6/132680986/zagaburivi.pdf
    • http://files.tonimosley.com/uploads/1/3/0/7/130739112/01341a004.pdf
    • http://files.sundaybeautycollective.com/uploads/1/3/1/4/131483318/980103.pdf
    • http://files.ggsastrophotography.com/uploads/1/3/2/6/132682039/8906629.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/xosagufededuduwogekuvige.pdf
    • https://cdn.shopify.com/s/files/1/0434/2569/3845/files/muwumenogulazina.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4326/files/68841738392.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/sasifuwamadoginunonu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5196/6873/files/surifelerofe.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4166/files/ccna_security_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/vuvikuzikam.pdf
    • https://cdn.shopify.com/s/files/1/0431/2878/3002/files/vabiraluxurijipisowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/mijodixa.pdf
    • https://cdn.shopify.com/s/files/1/0438/2015/5037/files/47696904068.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/73612014245.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_off000063bb.bin
10318506d3dde030796b865bdf0784a410f55768f23b1f03d82feb28fb09ec63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BB 5436 bytes
font_01_sfnt_off0000763c.bin
f64b09a000f32bab3e04b5d2d88cd3e80a1ec5874982ec79cbd7c51f5f88a334		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763C 10444 bytes

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