Malicious PDF — malware analysis report

Static analysis result for SHA-256 141a2005f4e914bf…

MALICIOUS

PDF

41.0 KB Created: 2020-08-13 09:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0c4a075dd44164d671f124477be0704a SHA-1: f10314b91b394aefa9896271e1966195f1115b32 SHA-256: 141a2005f4e914bfefa30713e4fc4e5e0764aefdb47df3f374caa6f5cd8dcfdb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a redirector URL associated with malicious activity. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to potentially harmful content through a link farm, likely for phishing or malware distribution.

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=analysis%20patterns%20martin%20fowler%20pdf In PDF document text
    • http://falexej.floorstogoblog.com/uploads/1/3/0/7/130738526/8305923.pdfIn PDF document text
    • http://nulaf.flykingzcollection.com/uploads/1/3/1/6/131606349/posubofejeten.pdfIn PDF document text
    • http://files.holidaylightingstl.com/uploads/1/3/1/4/131484133/vomiraledilegol.pdfIn PDF document text
    • http://berapid.lee-simmons.blog/uploads/1/3/1/4/131483068/0e3471163a.pdfIn PDF document text
    • http://files.fortclarkdays.org/uploads/1/3/1/4/131411539/lojefinukorivesosim.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/1/0431/1141/5962/files/81005439866.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/71707945201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/56346782287.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/16589086126.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6722/7811/files/36628403097.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1465/1038/files/35432868883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1463/5165/files/52409144501.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9691/4600/files/36388119531.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5672/5153/files/giwijogoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7437/8138/files/fomidogupifa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1952/3480/files/format_of_experience_certificate_for_teacher.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8138/4604/files/fozakifimibe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0235/6124/files/aashto_t193_free_download.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 4

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_off0000623c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623C 5372 bytes
SHA-256: 1bfd8d6afca38f3b47571ea28c52aec476ff28520a4a4cae705ab7eac8b9c639
font_01_sfnt_off0000747e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x747E 10140 bytes
SHA-256: c19380d78573ed95f596b5c4f6f947efd41b49ee2eec30c2d27d518cf7daac7f

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