Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5dab5662d23e80…

MALICIOUS

PDF

40.5 KB Created: 2020-08-15 17:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c3a9737cda5f8228b8ab3238068c9e3e SHA-1: fa845491f8f40ed1882ac01857db90ada27fef04 SHA-256: 1e5dab5662d23e8014c36c0ffd743bb387367228f23206ff298331d9899d112d
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm hosted on cdn.shopify.com, designed to artificially inflate search engine rankings. One of these links, https://ttraff.ru/wb?keyword=concentration%20units%20pdf, is flagged as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious infrastructure through a deceptive link-farming scheme.

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/wb?keyword=concentration%20units%20pdf In PDF document text
    • http://files.ikargb.co.uk/uploads/1/3/1/4/131409170/c416f2d8c877.pdfIn PDF document text
    • http://dibamas.keithsfishingtackle.com/uploads/1/3/2/3/132302936/kutukaro-fikodexemu-divawo.pdfIn PDF document text
    • http://files.geteffect.net/uploads/1/3/0/8/130873717/6628571.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/1/0434/5213/7622/files/linux_combine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1935/3767/files/cape_town_tourist_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8070/3399/files/ansys_topology_optimization_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/13777942259.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/surufavugilimitebutibod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7751/0055/files/getting_there_a_book_of_mentors_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3769/5906/files/arabic_to_english_dictionary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2935/4917/files/stored_procedure_in_sql_server_with_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0560/8099/files/business_strategy_formulation_and_implementation.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_off00006252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6252 5024 bytes
SHA-256: ce52050583e4366c59dfc08cf0c4622dd5cebb639e1175a786833609e905f2c1
font_01_sfnt_off0000736a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x736A 10048 bytes
SHA-256: 345fd08dcfbbcd79ba619cef4e3de446b8cac3f543f3a72df882a8ff1727f581

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