Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8377fc21d2ca77…

MALICIOUS

PDF

44.4 KB Created: 2020-08-05 11:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6783cc1b89c1ddbb1cbf04773f34ca9a SHA-1: 5c68a897abfc85ff9c43b187da2bf1cf1a6959f7 SHA-256: af8377fc21d2ca77de0668b5710e503a1c15148f24358557589ef90dfc1ee7bf
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=idsa+candidiasis+2020+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, likely for SEO manipulation or to obscure the malicious redirector. No scripts were extracted from this sample.

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=idsa+candidiasis+2020+pdf In PDF document text
    • http://files.beechtreecustomcabinets.com/uploads/1/3/0/8/130874102/8788323.pdfIn PDF document text
    • http://files.scienceadventureprogram.com/uploads/1/3/1/3/131380308/towaka.pdfIn PDF document text
    • http://degiwer.31quotes.com/uploads/1/3/2/3/132303035/tasaralezuxemur_rudodobo.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/1/0431/0335/5034/files/30_qualities_of_an_entrepreneur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/dilekimogugurezokupowojux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7920/5018/files/mexegegujuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0756/6239/files/cantate_domino_ssa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0783/4272/files/danejalajiva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4853/3144/files/46162112246.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6799/0438/files/99171159986.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5135/1200/files/tiwilakuwitorurub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/97340094815.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/zuliroj.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 5

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_off00006fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA3 5232 bytes
SHA-256: af391f3350ad72ee4a039234dbe00460dc603a4312af673e525255ac647b3337
font_01_sfnt_off00008188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8188 10272 bytes
SHA-256: 7c66af3e3d7a00e021a7a63ed8c824d20ad9e91afa2b3b62afdc109ae7a82c45

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