Malicious PDF — malware analysis report

Static analysis result for SHA-256 637668662b3e191b…

MALICIOUS

PDF

46.8 KB Created: 2020-08-10 06:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d98d40cca9a882655f3596e2a4efa39c SHA-1: 01201f8bdc36ec0dce21e3087f2ef4dff48bd889 SHA-256: 637668662b3e191b111459059fa3ab17a5963b958d617faa6b44ecbb9079e12c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is flagged as malicious. This suggests the document is designed to lure users into clicking links that lead to potentially harmful content or further malicious downloads. 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=adjusted+cash+book+format+pdf In PDF document text
    • http://files.coloradowheatens.com/uploads/1/3/2/6/132681916/vasalapu-panipoxijato-rofuposotufule-retewaneko.pdfIn PDF document text
    • http://sewiz.jillstarlingnovels.com/uploads/1/3/1/0/131070872/c453670faa.pdfIn PDF document text
    • http://files.ohkanpai.com/uploads/1/3/2/6/132681880/f4213fc.pdfIn PDF document text
    • http://duluvowef.michelleswafford.com/uploads/1/3/0/8/130814328/zabowuso.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/1/0431/9238/5700/files/gisopoguvida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5555/4455/files/likixitu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/sajado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5744/5029/files/kisobatezafiwolup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/60041512509.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6390/1334/files/wizimodakas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekugoxozeritazol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/lubogujov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3917/6342/files/3247393632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4175/8101/files/cookie_clicker_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0936/6427/files/bujiwitedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9726/8128/files/logub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6503/3383/files/ravan.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_off00007693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7693 5632 bytes
SHA-256: aaffb306ded570e83dfeec1d698a0270cc62e7506a38eec18ab07283fd83fb6d
font_01_sfnt_off00008995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8995 10776 bytes
SHA-256: 3cefb8da38f5bce6402b84cd448c44834396d279c5f01c0b5b118024027847d7

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