Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af9ca47f4c02664…

MALICIOUS

PDF

41.7 KB Created: 2020-08-22 07:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b7f17a2a7506df3e1cb0b055bb68ad02 SHA-1: 3a66fc457af3f704cb6469f3d2e012e6f62cfef7 SHA-256: 4af9ca47f4c02664feb65c63041aef307271efeace7288f2dacafffd8bc1d73c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=dk+encyclopedia+pdf+free'. This URL is presented within the document body, suggesting a social engineering attempt to trick users into visiting a malicious site disguised as a free encyclopedia. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify, likely for SEO manipulation or to obscure the primary malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=dk+encyclopedia+pdf+free In PDF document text
    • http://files.mrhansondai.com/uploads/1/3/1/6/131637178/7524635.pdfIn PDF document text
    • http://files.mysonthesuperhero.com/uploads/1/3/1/8/131857315/7555e446b8.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/1/0431/0705/7825/files/72733579805.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/surah_yasin_dan_tahlil_full.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/201181881.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4869/6993/files/countries_of_the_world_and_capitals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/99422179723.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5349/5958/files/puwawo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/biblia_de_jerusalen_catolica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8762/4344/files/55680332528.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/mimijulovugidugo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/9506/8565/files/acquiring_medical_language_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/seduzokusujejadusinegev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/comment_apposer_signature_document.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1216/1685/files/water_aerobics_certification.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 3

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_off00006565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6565 5136 bytes
SHA-256: 54b3cf1bd6ffb23e5a0513f0a14a18a0ac61b0b6ac899134d741a2c3a4e53a85
font_01_sfnt_off000076fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76FA 10260 bytes
SHA-256: ac2ed38f6b2f27142319603eddf8d579dfca970a35e28e0d9fabbfd95a266d51

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