Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4de0c00b90b6012…

MALICIOUS

PDF

44.9 KB Created: 2020-07-30 17:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9d83ab49e04291963275044c7dcec7a1 SHA-1: 7619d0931580aa745aa1a9bfdd2220913338ffe5 SHA-256: c4de0c00b90b6012369c6d4373d0c0e15aa7426890f7bc1c75ff7d26b9b42ccb
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, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm. Another critical heuristic, PDF_MALICIOUS_REDIRECTOR_LINK, flags a link to ttraff.ru, which is known malicious infrastructure. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to contain text related to 'internal auditing', likely a lure.

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=definition+of+internal+auditing+pdf In PDF document text
    • http://files.bolstersunderway.com/uploads/1/3/1/4/131406592/sutab.pdfIn PDF document text
    • http://files.christierecords.in/uploads/1/3/1/0/131070483/2715171.pdfIn PDF document text
    • http://files.chrisgriffithdesigns.com/uploads/1/3/1/0/131070098/6625889.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/1/0430/7920/5013/files/lakesodomisuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/25040641280.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2011/6380/files/sisivixiduwavewavumelez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/xagobutano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/60941292454.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/34382067127.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/89677405488.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/23623487725.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/zulexinoxidaweko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9939/8052/files/zefotobivago.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/womixaxeferez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6408/2073/files/marufokukudaxakijipisop.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 7

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_off00007386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7386 4912 bytes
SHA-256: 9d2a0dff5f47a177b9b8e441cb64a011a73861faf58ff9b417a02ebdf5897fc4
font_01_sfnt_off00008446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8446 10052 bytes
SHA-256: a82e42d3efc3b06cda5965026bf8b7890cf9b31952b6eb725a7c7c67a24c4e35

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