Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b21fb87e2cddb14…

MALICIOUS

PDF

42.8 KB Created: 2020-08-23 19:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5e37164861b8fc8d5b0eb31346c422b SHA-1: 8e301027cd31fae986a46a334898dc91449c7a58 SHA-256: 3b21fb87e2cddb14071844eab73c9dc9ecc5b2d9a02df95933febd59aa23ca1f
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.ru. This suggests the document is designed to abuse SEO link farms to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. 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/pify?keyword=blog+template+microsoft+word
    • http://files.authorjdnelson.com/uploads/1/3/1/6/131636584/3189421.pdf
    • http://files.houseoflard.com/uploads/1/3/1/3/131381677/8a09d18d2fdc67.pdf
    • https://cdn.shopify.com/s/files/1/0430/3663/9395/files/bible_study_guide_for_young_couples.pdf
    • https://cdn.shopify.com/s/files/1/0435/6331/9445/files/nugipenoxetasegibok.pdf
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/fokogobalunezipijafibatu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9287/files/kakavumixinoxedod.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/50660523633.pdf
    • https://cdn.shopify.com/s/files/1/0430/8959/2473/files/filipino_sign_language_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0440/1335/5166/files/space_occupying_lesion.pdf
    • https://cdn.shopify.com/s/files/1/0454/2342/7752/files/beylikten_devlete_osmanl_siyaseti.pdf
    • https://cdn.shopify.com/s/files/1/0438/5836/2518/files/drying_shrinkage_cracks_in_concrete.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_off0000699a.bin
72c287c6804aee2ab7de5a9fa8f4b34f19702a904cf064cf23e1ef864efd4ed6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699A 5616 bytes
font_01_sfnt_off00007cad.bin
d37fe7c6c94ab698dd8c81e02658c7ec4bd00a5b78388909deb07eda54ef27ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAD 9900 bytes

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