Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2581ea2fa8d87bf…

MALICIOUS

PDF

42.4 KB Created: 2020-08-20 19:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 64b4271f577395afac79fd8ba24a2a81 SHA-1: 291889d78a4b8902cf22094b1733a61a47852772 SHA-256: b2581ea2fa8d87bfe472d9a0356c9c73abc04c45c26067432dec19d4713971c6
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, disguised as a PDF about breathing exercises. 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=types+of+breathing+exercises+pdf In PDF document text
    • http://regof.sardonicpoet.com/uploads/1/3/1/3/131379730/547719.pdfIn PDF document text
    • http://files.chazwaterman.com/uploads/1/3/1/3/131398507/zuduxozubovujonepipo.pdfIn PDF document text
    • http://zebifar.hyperionshand.com/uploads/1/3/1/4/131437626/4546697.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/1/0443/2855/0556/files/budget_planner_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/3586254873.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/biodigital_human_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/days_of_week_calendar_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/dermatitis_atopica_causas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/68581021596.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2344/0799/files/talujejosalojejuz.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_off000066c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C5 5644 bytes
SHA-256: 3a494690bfcb2ef7d3e3c00077e76b96b6b9b3386e6c64de4075053674a2f1b1
font_01_sfnt_off000079fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79FB 10244 bytes
SHA-256: a2eb9a2780acbfce82c4feb80bb676df369728fa4aee627a7ad230a84c37c7af

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