Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b21fb87e2cddb14…

MALICIOUS

PDF

42.8 KB Created: 2020-08-23 19:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b5e37164861b8fc8d5b0eb31346c422b SHA-1: 8e301027cd31fae986a46a334898dc91449c7a58 SHA-256: 3b21fb87e2cddb14071844eab73c9dc9ecc5b2d9a02df95933febd59aa23ca1f
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.ru. This suggests the document is designed to abuse SEO link farms to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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.ru/pify?keyword=blog+template+microsoft+word In PDF document text
    • http://files.authorjdnelson.com/uploads/1/3/1/6/131636584/3189421.pdfIn PDF document text
    • http://files.houseoflard.com/uploads/1/3/1/3/131381677/8a09d18d2fdc67.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/1/0430/3663/9395/files/bible_study_guide_for_young_couples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6331/9445/files/nugipenoxetasegibok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/fokogobalunezipijafibatu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2661/9287/files/kakavumixinoxedod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/50660523633.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8959/2473/files/filipino_sign_language_dictionary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1335/5166/files/space_occupying_lesion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/2342/7752/files/beylikten_devlete_osmanl_siyaseti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5836/2518/files/drying_shrinkage_cracks_in_concrete.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 4

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000699a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x699A 5616 bytes
SHA-256: 72c287c6804aee2ab7de5a9fa8f4b34f19702a904cf064cf23e1ef864efd4ed6
font_01_sfnt_off00007cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAD 9900 bytes
SHA-256: d37fe7c6c94ab698dd8c81e02658c7ec4bd00a5b78388909deb07eda54ef27ef

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