Malicious PDF — malware analysis report

Static analysis result for SHA-256 377a81cb717e3c1e…

MALICIOUS

PDF

43.1 KB Created: 2020-08-10 15:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5b327b1b2dc5d4dee8eed5e913f8a1cc SHA-1: 1343f4c735a2699badd60cc39bbe32388a2bf22e SHA-256: 377a81cb717e3c1e6053e919d0485b5476a2dc14d363748b7d38de23d9d0743d
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm. One critical heuristic firing indicates that the document links to known malicious redirector infrastructure, specifically 'ttraff.ru'. This suggests the document's primary purpose is to redirect users to malicious sites, potentially for phishing or malware distribution.

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=character+description+exercise+pdf In PDF document text
    • http://files.greenlandscapescornwall.co.uk/uploads/1/3/0/8/130813747/pasiwatozenajap-zuwozinow.pdfIn PDF document text
    • http://files.ikargb.co.uk/uploads/1/3/1/4/131409170/c416f2d8c877.pdfIn PDF document text
    • http://files.vividskateshop.com/uploads/1/3/2/6/132681690/7876132b56a.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/1/0428/9835/8432/files/11067845032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4167/6694/files/tudasodozupukewoxuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/20674558921.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5556/2398/files/adding_and_subtracting_radicals_quiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/kulolusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8858/0512/files/advantages_and_disadvantages_of_communication_technology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/wimapaduvefivuket.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8253/8403/files/gijasexadepexiregavalufig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9711/0168/files/stats_modeling_the_world_ap_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/maytag_mhw5500fw_consumer_reports.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/5365/6738/files/47059055719.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A89 5184 bytes
SHA-256: 64793a4375fb5ce7351b1a6536182197d508413cb02f01c1dc6b9887f893d8f7
font_01_sfnt_off00007c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C29 10416 bytes
SHA-256: 135538c5b74918c5fcc4b5dc1d90840a3e977160567adf463c7e605511ebbaaa

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