Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fcb5408c0f05005…

MALICIOUS

PDF

40.7 KB Created: 2020-08-02 00:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f6a7d98a772bbd645b6a3dd6cafe9921 SHA-1: 575374ea6ba2c1a5272649bf0b78bf010c40d005 SHA-256: 4fcb5408c0f05005d841dd2215fe245599e40c2d7362317a017d8fd84ac7ab3f
202 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious Link T1566.002 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a link to a technical manual. The document also hosts a large number of links to other PDFs, likely for SEO manipulation to improve search engine ranking for malicious content. The presence of a fake invoice lure further supports the social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=eaton+industrial+hydraulics+manual+5th+edition+pdf In PDF document text
    • http://files.kathleenbrownpsychicmedium.com/uploads/1/3/0/7/130775950/dinetepoxo.pdfIn PDF document text
    • http://files.mytotalnutrition.com/uploads/1/3/1/0/131070212/892c1.pdfIn PDF document text
    • http://files.cozykidsembroidery.com/uploads/1/3/0/7/130775228/7d6c5a24e.pdfIn PDF document text
    • http://files.swctoa.org/uploads/1/3/0/8/130873951/5040845.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/1/0438/2395/6125/files/zunewutagob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5754/3328/files/79829319358.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/zuzakofedopubivabokiriwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3807/9138/files/bobid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/28525740760.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/kitchenaid_dishwasher_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4071/7472/files/femafiguperabetufemot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/merusirixiguloju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/78170907938.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3445/0840/files/87903135531.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2635/8173/files/povijaxu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5136 5460 bytes
SHA-256: a5bef24d43b64aa537396907e793df394ae3675f148474353327b80de85d209e
font_01_sfnt_off000063a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A2 10428 bytes
SHA-256: cfe9b7c35a541d4aa69b44ffb82d048a79711d67a9db46735535de0057d07f6f
font_02_sfnt_off0000873f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x873F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2