Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb0de3aaf3855af…

MALICIOUS

PDF

41.6 KB Created: 2020-08-09 09:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ad2c320b7930c6ac76470d061d7938d2 SHA-1: 1a1837a5b4dad87180a9a72f2cd4de15f72a4d1f SHA-256: dfb0de3aaf3855af2a6d51202cf84a82a08eba89163e78c9a6ceddcf0e84ad54
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also functions as a link farm, pointing to numerous other PDFs, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the primary malicious action appears to be redirecting the user to a harmful site.

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=catabolismo+del+nitrogeno+de+los+aminoacidos+pdf In PDF document text
    • http://files.christinarjackson.com/uploads/1/3/1/3/131379110/jaroropo-wedabipitofivif-bonefuso.pdfIn PDF document text
    • http://files.edityourwebs.com/uploads/1/3/2/6/132682882/suwudawene.pdfIn PDF document text
    • http://files.uchpchicago.org/uploads/1/3/2/6/132696214/ruboxewewuruguraz.pdfIn PDF document text
    • http://files.rijkewijnen.nl/uploads/1/3/1/4/131453146/lasinabax.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/1/0433/4862/3510/files/95899814413.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/how_to_cancel_directv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9923/4203/files/77956452892.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6436/8021/files/24756994750.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0393/5902/files/lusiwuwopolul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/cath_lab_procedures_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7474/7545/files/abstract_art_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/19078334249.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 8

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_off000059c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59C8 5520 bytes
SHA-256: b57be721bddb4328424770c1960026132e1bfff891bfe08852e4ffd2be45911c
font_01_sfnt_off00006c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6C 14916 bytes
SHA-256: 01f96a18a835163afe54a2261bf36c7420e1811fc3f6c2d134ed64ab579417f4

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