Malicious PDF — malware analysis report

Static analysis result for SHA-256 66252f9cac2c3a59…

MALICIOUS

PDF

115.6 KB Created: 2020-07-30 11:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4455c086e0361fa87cf67766c9b301c4 SHA-1: 593a3167fc3553cd71630cc07038c0eeb07f9542 SHA-256: 66252f9cac2c3a5957ee5901627875ae50e52c250c254733866d548a7fd3eded
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to 'ttraff.ru', identified as a malicious redirector. This suggests the document is part of a link farm or SEO spam campaign designed to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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=livro+fundamentos+da+administra%25C3%25A7%25C3%25A3o+da+produ%25C3%25A7%25C3%25A3o+pdf
    • http://files.stjohnsdunellen.org/uploads/1/3/1/6/131606046/ee04d81830cd9a.pdf
    • http://files.renaissanceone.org/uploads/1/3/1/4/131408117/feraratofibulosa.pdf
    • http://files.tuftslaw.net/uploads/1/3/2/6/132683088/ximug-xorulem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/52909587156.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/rukikobagutag.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6605/files/11284255776.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/kasovufiwokimezexe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/69512830315.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/vezoneroveligasumi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4655/8113/files/37154897499.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/fumaduzox.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/9166066993.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/ruzibamuxivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1311/9905/files/linatuvomagerutusekifade.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9442/files/monepolivuwozizipopubi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/ziwemarexanovisuze.pdf
    • https://cdn.shopify.com/s/files/1/0439/6069/6990/files/73836528742.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_off000181dd.bin
6567272d5751b5a1ddfb43ef78dfdc65ec679c254eaa4f5f3468fae4e60811f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181DD 5536 bytes
font_01_sfnt_off00019407.bin
c7dd4fc049be1d1ba2d690f5acb6c1c79492834fb749b930fc88af67e66abb61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19407 14064 bytes

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