Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fd5734b5168f0e…

MALICIOUS

PDF

50.8 KB Created: 2020-08-11 23:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ffb94dfc4ee1b0bd1a580adb22007773 SHA-1: 39b0e7aa97792616ecd7032ae327fbcf1ae2b05c SHA-256: 16fd5734b5168f0e1b0d4c4e7eda5582f95f5bedc30e7b0a020fa8eeb1b5e7d4
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to redirector infrastructure, with a primary URL being 'https://ttraff.ru/wb?keyword=guinness%20book%202019%20pdf'. This suggests an attempt to drive traffic to a malicious site, likely for phishing or malware delivery. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious 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/wb?keyword=guinness%20book%202019%20pdf In PDF document text
    • http://files.fitznells.co.uk/uploads/1/3/1/3/131382955/362b8b36c4d9.pdfIn PDF document text
    • http://files.jmdigitalphotos.co.uk/uploads/1/3/1/6/131606758/kewajebugar.pdfIn PDF document text
    • http://vulifu.thequiltingretreat.com/uploads/1/3/1/3/131380600/miwisozakojabadujon.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/1/0432/2331/8686/files/68036654890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/vedebizilur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5560/2078/files/91962046004.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5478/3893/files/74326711822.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/93593606359.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0496/0676/files/11838620538.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7424/1187/files/89864615284.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/bulokisosimofifabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9245/1232/files/fapiwegip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7244/6873/files/14308699440.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/32914748004.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/0733/1739/files/dc_circulator_route_map.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 3

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_off000087ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EA 5416 bytes
SHA-256: afd8b38fc2672c3b2c0cdc9d9c5d1142488b22b4083ba88dc4735437ab39a8ab
font_01_sfnt_off00009a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A6D 10500 bytes
SHA-256: 0ad58de35caaa8561d5585e04116f462ef194605064a79a365990fb2ae2d5e8d

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