Malicious PDF — malware analysis report

Static analysis result for SHA-256 370a4ef39971f807…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 13:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1f910603558769a3e0929cf60802b799 SHA-1: 67a11851ee1e95cc3c4f9f4b33f077b1feba546b SHA-256: 370a4ef39971f8079a49e7d7173054b6eb60e54a6f20fe771cc7250493f63df9
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDF files hosted on Shopify. This is indicative of a link farm or SEO manipulation tactic. Crucially, one of the embedded links redirects to `ttraff.com`, which is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.com/pify?keyword=verbos+irregulares+uniforme+biforme+triforme In PDF document text
    • http://files.freeclinicsv.com/uploads/1/3/1/1/131164129/8052866.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/31181894348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2282/6144/files/fewekodupunut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7412/4950/files/91348386991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/fundamental_accounting_concepts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/81820688593.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/xirupip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1765/8780/files/board_member_job_description_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0999/0043/files/gobikuwomefa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1052/2268/files/bujim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6485/2634/files/semiruvakivegimawoj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5940 5072 bytes
SHA-256: 3faf65366c6bb473049e3b7c7dbba765973e013173d23bbc37ca95d3148037bb
font_01_sfnt_off00006a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A69 10068 bytes
SHA-256: 57d4cb3f2a3fcbb1b7f1489bcb97ddd7ba0d4107c333ecf7647787703db7d567
font_02_sfnt_off00008cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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