Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77fbc362755d532…

MALICIOUS

PDF

45.4 KB Created: 2020-08-23 10:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 066b6e2ace57215e79a7e0760b8417b0 SHA-1: 11208d26dca6d3746fe75c9979d855590710e614 SHA-256: c77fbc362755d532c37844018b3dd15bc935c49e114630e84e04237f76868dc7
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 of which point to external resources, a technique often used to obscure malicious intent or to engage in link farming. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the same URL and references to other PDF files, reinforcing the link-based attack vector.

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=heterozygous+familial+hypercholesterolemia+treatment+guidelines In PDF document text
    • http://files.briona.org/uploads/1/3/2/3/132302718/vaxapijumezi.pdfIn PDF document text
    • http://files.leslieaaronson.com/uploads/1/3/1/8/131871433/pubewo-folatelowemuwu-rixen.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/1/0436/4333/8912/files/dubai_monorail_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0453/2648/files/77710446378.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/advance_care_directive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0089/7440/files/adolescent_problems_and_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1184/5793/files/ielts_speaking_topics_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/norojakibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2799/4523/files/wolasekupiwule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/fetox.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 5

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_off000065de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65DE 5680 bytes
SHA-256: 9107659f2a9235d4cf2e5cdeba0706a5d0b2266c084c6c43294656682e62bae8
font_01_sfnt_off00007923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7923 15372 bytes
SHA-256: 15b4a36f7d8d939444a67698f99189ad538b9cd34ec4f7589907eab3b9928f32

Open this report in the interactive analyzer, or submit your own file for analysis.