Malicious PDF — malware analysis report

Static analysis result for SHA-256 728e1130de7fae64…

MALICIOUS

PDF

59.0 KB Created: 2020-08-12 01:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 586ed7c7108bb11ae7898c6dc034eb34 SHA-1: ee274386571d190d49302d42c45c39a9bcd02e67 SHA-256: 728e1130de7fae64fe7d8e3cdac2a3720aa4d20c98a70aa66f15412f18e33e77
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically a redirector at 'ttraff.ru'. The document body and heuristics indicate a lure related to downloading marriage biodata, which is a common phishing tactic. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=marriage+biodata+pdf+format+free+download In PDF document text
    • http://files.sos22.ahsc-nm.org/uploads/1/3/0/7/130738569/6329131.pdfIn PDF document text
    • http://pajev.lamour-du-chocolat.com/uploads/1/3/1/4/131452883/d39015787a0481.pdfIn PDF document text
    • http://files.cmclarkscenic.com/uploads/1/3/0/7/130738657/bigilegibife_legixase.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/1/0438/5056/3734/files/13326031008.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2321/9363/files/house_of_1000_corpses_cast.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2585/6672/files/liggghts_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8476/7641/files/jinugizezanadarim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/1947/1781/files/benchmarking_libro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97098861098.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4910/6073/files/active_release_technique.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4550/3655/files/41201217782.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1756/6368/files/integration_formulas_for_class_12_hsc.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_off0000aa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA3E 5420 bytes
SHA-256: 395bf363603a6cce5acccd59bd44a4e062133e925b0314391f5acfed148199b1
font_01_sfnt_off0000bcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAC 10120 bytes
SHA-256: a77146da9f1da85666286f362352de44c7f5902074ceb7910b92e475249f3004

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