Malicious PDF — malware analysis report

Static analysis result for SHA-256 771fb06b407c26d5…

MALICIOUS

PDF

74.6 KB Created: 2020-08-07 16:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 723a3a641c45fdf6681c43fb02eeaca9 SHA-1: cc6ce26a74824b11fda7906d85ef985d0da1730c SHA-256: 771fb06b407c26d50d42867bbe5b3311bf5966436d6cc4a19577f9d3fef26f81
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a redirector service known for malicious activity. The document body and heuristics indicate a lure for free downloads, likely leading to a phishing or malware distribution site. The primary malicious URL identified is ttraff.ru, which is used to redirect users to other resources.

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=no%25C3%25A7%25C3%25B5es+de+aprendizado+de+m%25C3%25A1quina+pdf In PDF document text
    • http://files.chen-lu.co/uploads/1/3/2/6/132681501/9771806.pdfIn PDF document text
    • http://files.networkhearing.net/uploads/1/3/1/4/131453256/witumar_zuxovatofeme_nataromeba.pdfIn PDF document text
    • http://files.alldonemarketing.com/uploads/1/3/0/7/130775221/3822325.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3706/4344/files/gesiwosifibaposano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1597/7630/files/managing_oneself_by_peter_f._drucker.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/morisulumamanedozazuvojid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarexomerowomowubufo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4291/2926/files/livro_barra_de_access_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9368/0547/files/rozirobumeregixun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/pokemon_platinum_rare_candy_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8977/2190/files/95107988491.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/josof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1946/7943/files/jinutumolojazusekuga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 5736 bytes
SHA-256: 156d108a9155e9fe7aed81fbb494aa9085273f6c307c1f53be627186c33d1f20
font_01_sfnt_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 13948 bytes
SHA-256: 2e40a1afbf07daebeb518c319b902fb8ad969d22251980620ecafcdcf3c6111d
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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