Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66281018ec4cd3b…

MALICIOUS

PDF

35.0 KB Created: 2020-08-12 17:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8617b9bdb179e80f1dfbb0d4bdcfbe09 SHA-1: d0e7d8f24363ae1fab12f4fdbf8e6c00f9136460 SHA-256: f66281018ec4cd3b784772666cbf5c7c9ab619bd1cc868f6db7baa2573a1f1b1
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, characteristic of a link farm designed to improve search engine rankings or distribute malicious content. One of the primary links, 'https://ttraff.ru/wb?keyword=tropezar%20con%20la%20felicidad%20pdf%20descargar%20gratis', is flagged as a malicious redirector. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document but rather a container for malicious links.

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/wb?keyword=tropezar%20con%20la%20felicidad%20pdf%20descargar%20gratis In PDF document text
    • http://files.wisconsinpurplemartins.org/uploads/1/3/2/6/132682970/7308128.pdfIn PDF document text
    • http://rabopidiv.churchonthehillglenavon.com/uploads/1/3/1/1/131164250/vubebimusudif.pdfIn PDF document text
    • http://lurolopi.uprighthealthandwellness.com/uploads/1/3/0/8/130874474/b57b907ec993.pdfIn PDF document text
    • http://files.flight111.co/uploads/1/3/1/3/131398369/4079564.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/1/0433/0805/6740/files/65578001922.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/mibewupuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3840/7832/files/ascaris_lumbricoides_ciclo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7430/6719/files/xegovo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4625/6295/files/39154143097.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1762/4990/files/pomekamokozopafemabelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5812/6245/files/8026346315.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8220/3811/files/memutikiluledibubuteselib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1338/2044/files/maths_textbook_grade_12.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8158/7095/files/felarod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vewurobafug.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 2

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_off0000494f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x494F 5324 bytes
SHA-256: f0d6d75d230692413e4536452bd7862d49b20946499f9048ce0c50d55d85aa7d
font_01_sfnt_off00005b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7A 10776 bytes
SHA-256: e1709367b50c6c8e8ff181853cdcc861b7b64a0fcab7ae6f293ca3d1e6a97bea

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