Malicious PDF — malware analysis report

Static analysis result for SHA-256 866cbd9bd907dfe5…

MALICIOUS

PDF

112.8 KB Created: 2020-08-05 06:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1971ca0cc5199480ed63cd0c8b98e8b0 SHA-1: 39cc29eb261e656b8d3adda9fa10a6d9455ed93c SHA-256: 866cbd9bd907dfe5adbae2ee78da647a181d3fc3ce7737365a76ec9829b110b0
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to a redirector service (ttraff.com) which is flagged as malicious. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting the primary purpose is to redirect users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

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=afrikaans+taal+pdf In PDF document text
    • http://files.thecotswoldsgentleman.co.uk/uploads/1/3/2/3/132302940/b0d74.pdfIn PDF document text
    • http://files.cuestacollegerodeo.com/uploads/1/3/1/4/131483550/f518ae417.pdfIn PDF document text
    • http://files.ellvenus.com/uploads/1/3/2/8/132815318/de077f64869c.pdfIn PDF document text
    • http://pabifino.phastudycenters.org/uploads/1/3/0/8/130874197/texiwodin.pdfIn PDF document text
    • http://xudude.kodiaksfirearmtraining.com/uploads/1/3/0/7/130739564/jonefepulatifalufala.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/1/0431/6997/2392/files/rezuvezogokovesekavarekow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/wufuxel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2517/0595/files/ritijof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3301/0074/files/kagakumaje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/4320/4765/files/calendario_escolar_2020_a_2020_sep_para_imprimir_en.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/garixuseja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8556/8923/files/torujopapizubiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1698/5503/files/satodozumebatewox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/89590618051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/12522124507.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/kefesup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/69387462506.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_off00016b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B18 5088 bytes
SHA-256: 78b687022675b68b5bd8b806f45d2676c41406151426179662986bb244b004fa
font_01_sfnt_off00017c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C7C 19288 bytes
SHA-256: 710dda848beb160bd2722e1bbc48390d0f5bb7aa8749fa0a9cb532ce0f304cfb

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