Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d1df61b366958c…

MALICIOUS

PDF

41.0 KB Created: 2020-08-14 01:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2e6aa7391c6cb9920e0f7e232d3e5f09 SHA-1: 87aa4d1911846d8bfb26de5bdde5cb50f9367834 SHA-256: c2d1df61b366958c2b6a1624925aaa72b843a320a0c0ee4a524962d80d50528e
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 Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector at `ttraff.ru`. This suggests the document is designed to lure users into clicking malicious links under the guise of providing academic resources. The ML classifier strongly supports the malicious verdict.

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=longman+academic+writing+series+1+answer In PDF document text
    • http://files.uktravelhacking.com/uploads/1/3/0/8/130813846/1494025.pdfIn PDF document text
    • http://files.executivesuitesofcapecoral.com/uploads/1/3/1/3/131384098/9190152.pdfIn PDF document text
    • http://files.portugesestonethenaturalpath.com/uploads/1/3/0/7/130739712/902317.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/1/0433/5117/9423/files/english_speaking_improvement_tips.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2708/4965/files/92579840793.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9809/5272/files/dopagujadurop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21086069096.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/duxebafemobijinikowomar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7335/3366/files/itextsharp_c_getting_the_comment_from.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/34399611323.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6764/5852/files/64965187839.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/3462/8516/files/practical_management_science_4th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4597/6221/files/7990147644.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/vivurunivekerofuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/demonimajifila.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_off000057ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57CE 5312 bytes
SHA-256: 3b49d703c5d7edaad1221d758be2d52426c6b0092d7ffa9d35468a87813692ed
font_01_sfnt_off000069d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D9 14552 bytes
SHA-256: 8d38852b6d5634182edad3b9f4223af2d74586e6296d864df442974d906bcfcb

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