Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a5c698dc88988d…

MALICIOUS

PDF

41.1 KB Created: 2020-08-19 02:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b33a014fd36962173a71408a694cbf66 SHA-1: d29010db48d73d853ba4cf1372f462fb7396c8f0 SHA-256: 66a5c698dc88988d0a27274d20cdf109be65171d394356aa8facd4becfbc4614
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a link farm or phishing lure. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing attempt disguised as a document related to 'fishing barents sea king crab'. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=fishing+barents+sea+king+crab In PDF document text
    • http://nemedivo.afrisekgroup.com/uploads/1/3/0/8/130814328/8f469.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/1/0438/2588/9442/files/pimot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/6417092025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5187/6509/files/wordly_wise_300_book_8_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/pavavukigarakal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6444/9437/files/matixeju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5516/9182/files/burnaware_shaper_pro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5060/6497/files/analytical_chemistry_multiple_choice_questions_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/rerode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/29243348732.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/bavusimagividozipob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5984 5188 bytes
SHA-256: f24fd62e98b425dc9cfb5a102afd4cabc199a5276ff8703285a8bfedfa3629de
font_01_sfnt_off00006b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B14 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000073a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A2 10580 bytes
SHA-256: 1e219b4eb2c072e5021c46a8d67f2647ecf53123bb7f2d427c7198a918de3be8

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