Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b62b57c6d83b10e…

MALICIOUS

PDF

44.7 KB Created: 2020-07-30 23:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 9502115fe29adaeb0dec8a4ae131bffa SHA-1: f23155f084eac31a917e428770c448743366b034 SHA-256: 3b62b57c6d83b10e2054c2494bf6e43b2a0f8b7992c1fea15deda5e75f492420
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'anatomy and physiology of human urinary system pdf', suggesting a lure to attract users searching for specific content. The primary malicious IOC is the redirector URL.

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=anatomy+and+physiology+of+human+urinary+system+pdf In PDF document text
    • http://files.ncstoragebarns.com/uploads/1/3/0/7/130739802/pudep.pdfIn PDF document text
    • http://files.stuffyourfaith.com/uploads/1/3/0/7/130739362/6057853.pdfIn PDF document text
    • http://files.neeshazollinger.com/uploads/1/3/2/6/132681826/rapemaderik.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/1/0431/1423/4013/files/24876667330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2216/1832/files/7426555230.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/vafofatofeziviruwon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7644/2519/files/degidakolarakowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3676/2527/files/78434511447.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83406059157.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/70133549832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1023/6321/files/nizodesumukofa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/67709636391.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/wubemomuraredalowup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3723/6117/files/63612139520.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_off000070c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C9 5428 bytes
SHA-256: 73159f5003c1830fe3267a790fc3e53cb9418cf57bd0fd6ab27d1e58ca8f017d
font_01_sfnt_off00008313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8313 9896 bytes
SHA-256: 359d8008a35309bac95ba1db4112f957f46d58838ea7e04987c3f27c9450b287

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