Malicious PDF — malware analysis report

Static analysis result for SHA-256 3641ec8f5a342a35…

MALICIOUS

PDF

38.6 KB Created: 2020-08-08 04:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 181b68f9db32c788b80aad976deea966 SHA-1: c8b7c72ca98ac6bba0dc0479afdde7b3a87fb5e1 SHA-256: 3641ec8f5a342a358df55c52a1953618c83ac222edb10d91f189035b29527faa
194 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and contains numerous embedded links. One of these links, https://ttraff.ru/wb?keyword=worksheet%20verbs%20kindergarten, points to known malicious redirector infrastructure. The document body itself is heavily obfuscated but contains references to the same malicious URL and a large number of other URLs hosted on Shopify, suggesting a link farm designed to lure users to malicious content.

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/wb?keyword=worksheet%20verbs%20kindergarten In PDF document text
    • http://files.camptonforward.com/uploads/1/3/0/8/130814397/nimifale.pdfIn PDF document text
    • http://files.satekuu.com/uploads/1/3/0/8/130814110/migidavedif.pdfIn PDF document text
    • http://guruwigi.14barreldesigns.com/uploads/1/3/1/4/131437812/mesewosigoj.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/1/0427/5575/2103/files/17598273772.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/bopozikegoboburu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8062/1984/files/forever_2014_tv_series.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/51548064897.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/foduzotalokakajaperolizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2105/6672/files/design_patterns_in_java_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/41289693502.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/58602540888.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/sobirininasize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8108/0725/files/mupikexifem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5549/5833/files/66714414411.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 1

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_off00005878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5878 5332 bytes
SHA-256: a0ecc7701ca8a3c651c37cbe780850a7969c6e1f85067fb5cde6cf53e998bc25
font_01_sfnt_off00006aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA6 10348 bytes
SHA-256: 8797f156aaf980e74a07460fde8161adbf3beea2724f882ad3348890212f6488

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