Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dd36fc1037f5cd…

MALICIOUS

PDF

33.5 KB Created: 2020-08-21 01:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 034a5949f2d70c261cb5bd8916b078ba SHA-1: 01a3110b65928782f403e81a1ac3c2cd55c5e167 SHA-256: d0dd36fc1037f5cde810b33aa048f5402449c9417a436826ca2ba0fa0aada5a4
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 of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or SEO poisoning attack designed to trick users into downloading potentially malicious content by disguising it as legitimate documents like answer keys or guides. The ML classifier also strongly indicated maliciousness.

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=solubility+curve+worksheet+1+answer+key
    • http://kalav.allamericandogexpo.com/uploads/1/3/0/9/130969332/ninej.pdf
    • http://files.maelasesethics.com/uploads/1/3/1/4/131438079/vakapufojex.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6166/files/weight_lifting_guide_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1560/files/nepowejiwud.pdf
    • https://cdn.shopify.com/s/files/1/0438/3195/1517/files/tv_guide_san_jose.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/mixugenejojezizifid.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/kaguteto.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/jusebo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3088/0162/files/building_maintenance_services.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7203/files/52146633141.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0447/files/60790191269.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_off0000446d.bin
ac1d66717c247ca8d8243cbdbeed2a2cf4592e3ad50e0e2e3d82b9ab4a8fed7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x446D 5500 bytes
font_01_sfnt_off00005730.bin
c91513b2ebe5eedf36642ea4aa150ddfe9e86647b2d9931e9b22aa5259d10033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5730 9456 bytes

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