Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a3f9caeb5ec921…

MALICIOUS

PDF

40.9 KB Created: 2020-08-09 02:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4c319b533e4fb0ea63ed432159b126f1 SHA-1: 1f669c9735a73566c43d325344694f5f37cc56c5 SHA-256: 85a3f9caeb5ec921d433080164ffbf30af0ca65ae19ec8644f368358f497f004
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a primary redirector identified as 'ttraff.com'. This redirector is flagged as malicious and is part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its malicious intent. The ML classifier also strongly indicated maliciousness.

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=stratigraphy+and+paleontology+pdf In PDF document text
    • http://poxozinel.gaslampgiftgallery.com/uploads/1/3/1/6/131606758/6319546.pdfIn PDF document text
    • http://files.thecococouture.com/uploads/1/3/1/4/131408209/9917469.pdfIn PDF document text
    • http://files.fincalossuenos.com/uploads/1/3/2/6/132696111/b4e38528e076.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2269/4038/files/dogoponuduwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1877/9800/files/js_loop_through_object.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/zutijus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1254/6975/files/39957002900.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4659/2924/files/nozomanoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/6510674270.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0909/7384/files/20482538253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/couchsurfing_im_iran.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1931/3062/files/69076994624.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/compress_to_smaller_size_free_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.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 8

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_off00005679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5679 3080 bytes
SHA-256: 0fcef192c95d6fd4d5333de3e5f0a04c8525a73f6e29f4febd37223f58d6e746
font_01_sfnt_off00006182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6182 5328 bytes
SHA-256: 91c148ef74ee6e5605f726abb2fc7c9c8e105b658d6e114ae5f812e52a9928f5
font_02_sfnt_off000073a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A8 10264 bytes
SHA-256: 033d23dadaafa47912aa3330b16037919c4243f3c90ee0100ba89294419479ba

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