Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ed3475031f0a9f…

MALICIOUS

PDF

64.5 KB Created: 2020-07-31 02:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 12759e47cc00e941deb9bd1e90fea7ae SHA-1: 5139508438acc3266f089c02f829fa3d13c35311 SHA-256: 66ed3475031f0a9fde425fea48ba853c232b0dbbdbd2069eb46c35cd4fc11d9f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links designed to redirect users to malicious infrastructure, specifically identified as a redirector at 'ttraff.ru'. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malware or phish for credentials under the guise of providing academic resources. No scripts were extracted, but 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/pify?keyword=clasificacion+y+filogenia+de+los+animales+pdf In PDF document text
    • http://files.ancestryseekers.com/uploads/1/3/0/8/130874296/mibone.pdfIn PDF document text
    • http://files.minnesotaflyfishing.com/uploads/1/3/2/3/132303035/vafusazikedagom.pdfIn PDF document text
    • http://files.erinmerrill.studio/uploads/1/3/1/3/131383514/89887.pdfIn PDF document text
    • http://files.monsieurbidule.com/uploads/1/3/1/3/131398360/7528800.pdfIn PDF document text
    • http://files.navinpokala.org/uploads/1/3/1/4/131483830/lijapapowodegisubuw.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/1/0430/8133/4951/files/42100285201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/niratumivon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2892/9947/files/tunigololenanedajuxewu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5768/4385/files/wozofeforinurez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/gogaveziwawasigevomikid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/3101648481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0566/5703/files/nasowalidevixadojasan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/68678484296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37144816260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4756/8039/files/dumese.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_off0000b9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E0 5212 bytes
SHA-256: 35cd8a2724742fab9f5629b0e39cde72c2fc73375a551b206be26253af156279
font_01_sfnt_off0000cb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 12172 bytes
SHA-256: bb2f94ac37124be3e7ff32489a8f1a950a767593df6e46a6466a924778a2935c

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