Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddf81751686cac8…

MALICIOUS

PDF

40.3 KB Created: 2020-08-05 17:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 149d6fe8a8a456a7e5cb44f15be3f54c SHA-1: 991ec68e6605937a65d5bc4fcd7db1df0402ce59 SHA-256: 1ddf81751686cac8474ef23fa8fa0b72376d798354ae1c2a288cf8e792130038
194 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm, including a suspicious entry pointing to ttraff.com. The primary attack pattern involves luring users to click on these links, which likely lead to malicious content.

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.com/pify?keyword=biomorphic+structures+pdf In PDF document text
    • http://files.silverspoondinner.com/uploads/1/3/1/3/131379485/d89041c3c9.pdfIn PDF document text
    • http://files.kathyglennstudio.com/uploads/1/3/0/7/130738852/wudenumujigikebijiba.pdfIn PDF document text
    • http://files.farrellheatingandcooling.com/uploads/1/3/0/7/130739227/f27913e8.pdfIn PDF document text
    • http://files.shellyliedtke.com/uploads/1/3/1/4/131437385/5357816.pdfIn PDF document text
    • http://files.sladkyzivot.net/uploads/1/3/0/8/130814926/vabazidivapakemimi.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/1/0431/2937/2832/files/83822185981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/27252094338.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2427/7923/files/42838683990.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/zeluwosorirogafopije.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5322/7936/files/vewaxezupodika.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/88667545303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/93179635965.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/65751569839.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/99396474849.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zumimulapowekulusevenire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/guwifojelifikobupod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/84964294544.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_off00006162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6162 5204 bytes
SHA-256: 7b0de2a8105ebf9f90bd7abf47eb099185ba6f39d74855909105cd8b5fc6c138
font_01_sfnt_off000072ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72EF 9828 bytes
SHA-256: f409f772d3b8f199124203d416498e2a298232d046501da5c219b1bc34bfcbf0

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