Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e3ab783659b671…

MALICIOUS

PDF

42.2 KB Created: 2020-08-12 02:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8a1cf5c3609128e2dfdb715db90da98 SHA-1: 7d8f33faafccb44c60f62f8876ea3f9246d63e65 SHA-256: 67e3ab783659b671e4a825a5559d1aea5b334f64a0205c2bc0d6745e278ebed5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a redirector link to 'ttraff.ru' which is known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and benign Shopify URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=pdf+to+autocad+converter+free+download+software
    • http://files.yogashak.com/uploads/1/3/0/9/130969910/zevuru.pdf
    • http://budimovis.socialinnovationfredericton.com/uploads/1/3/1/4/131407406/3357428.pdf
    • http://files.christinabethlehemphotography.com/uploads/1/3/1/6/131607889/motoj.pdf
    • http://files.dunblanebowlingclub.org.uk/uploads/1/3/0/8/130874067/nudasajuvopubaripus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2299/1007/files/52006270480.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/mupadogokepanuremofuva.pdf
    • https://cdn.shopify.com/s/files/1/0434/5649/5769/files/xeguposasewudefadeto.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6209/files/89128254146.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/laxefasigapabaxirasu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2370/files/48566640894.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/alexandre_dumas_livros.pdf
    • https://cdn.shopify.com/s/files/1/0436/4995/8046/files/15102064796.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/7232579208.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6147/files/wiwutubirajakunaw.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006792.bin
691087a4d7798abba2d9238154cca3c9a2fc50419d84481cce757a2bad3e836f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6792 5168 bytes
font_01_sfnt_off00007944.bin
309b87f1f2a111a9653944a905779d5455526978463a127960395aadfaae3274
pdf-font-stream PDF embedded font (sfnt) at offset 0x7944 9948 bytes