Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b59c8c977c716c…

MALICIOUS

PDF

37.7 KB Created: 2020-08-08 07:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 9799f4521b1501746732fd32813bbf2d SHA-1: 5b6a3f76b8a4e13c59d1d56419a4bb56026d4dfc SHA-256: a4b59c8c977c716c76895f7a91ed20a06511aa88e5ed63ea257a74c4c38fe905
194 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=libro+caballo+de+troya+4+pdf+gratis', which is also present in the heuristics. The PDF also features a link farm with numerous external links, many pointing to Shopify domains, suggesting an attempt to obscure the true malicious destination.

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=libro+caballo+de+troya+4+pdf+gratis In PDF document text
    • http://files.stoneranchpta.org/uploads/1/3/0/7/130739116/4e9eff098.pdfIn PDF document text
    • http://files.famousdoodles.com/uploads/1/3/0/7/130739452/5529058.pdfIn PDF document text
    • http://nokupamam.kristenlindseydudley.com/uploads/1/3/0/7/130740178/80d601b339040.pdfIn PDF document text
    • http://files.ownkcapparel.com/uploads/1/3/0/9/130969942/rojutilide_bipufukurasofu_lilisaxu_sinivudikawo.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/1/0431/9812/0096/files/puwezaporiduwogonodagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/budget_2020_20_date_pakistan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/45307313350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/92517016419.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/36745664890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/alternative_investment_strategies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/cessna_152_aerobat_poh.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2707/7032/files/47343727358.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/2792/5925/files/medical_laboratory_technology_books_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/intrinsic_pathway_of_coagulation.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 6

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_off000050d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50D1 5596 bytes
SHA-256: e579f28cd22754aa27ead1d32e3010342997e569ad9ed81130ab8871c242c884
font_01_sfnt_off000063f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F7 10988 bytes
SHA-256: 0777e1a30ec343ce16faf6eb0c3279b5ef672ad63bcda9771222046c121285e1

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