Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d991423ace84d6…

MALICIOUS

PDF

49.0 KB Created: 2020-08-26 11:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 91cf8f58b8833f4b605a22df8c29ec48 SHA-1: abb424563ba3f596cda274364809f26a5a19343d SHA-256: 18d991423ace84d66920ac1bb2405e44a3c0facba78da4e4ebb271f25c898101
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.com) designed to obscure the final destination. This behavior, combined with the ML classifier's high confidence score, indicates a malicious intent to redirect users to potentially harmful content, likely a phishing or malware distribution site. The presence of a link farm suggests an attempt to generate traffic or SEO manipulation for malicious purposes.

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=lanza+del+vasto In PDF document text
    • http://files.marinersguide.info/uploads/1/3/1/4/131414516/75d76.pdfIn PDF document text
    • http://bepaj.adskope.ca/uploads/1/3/1/1/131164394/tabozigeto.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/1/0448/2826/2560/files/chemistry_lab_report_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8298/0259/files/nobotatamis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/53176850084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80278007767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/24956212904.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/deductive_reasoning_questions_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/vetoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/74815151716.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0472/2425/8725/files/solegasubexokesovenul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/ejercicios_rima_asonante_y_consonante.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/42226789931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0954/0257/files/60519696114.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_off00008408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8408 4776 bytes
SHA-256: 55c5ffb684e0f43442560cd4ad161bf5193f1defea4ac1a8c5c1c5926598a106
font_01_sfnt_off0000946a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x946A 10296 bytes
SHA-256: 73d4b2635330eb102d4d0894949ed7affd49fcfa50932a0c7609e8178c90e163

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