Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc9f4140bb82f43…

MALICIOUS

PDF

42.8 KB Created: 2020-08-12 03:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5f2658b258fe75b6f03723c5e67652f2 SHA-1: 7c54bb446902573d428b021dc1157d8393e419ec SHA-256: cdc9f4140bb82f4392b9e52cbfa3b9d21b89db50ef9ca8ceb947b3af169fac1b
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, with one specifically pointing to a known malicious redirector. The document body is heavily obfuscated but contains references to wkhtmltopdf and a URL that appears to be part of a link farm. This suggests the primary purpose is to redirect users to malicious sites or to manipulate search engine results.

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.cc/pify?keyword=stages+of+embryonic+development+of+the+zebrafish+pdf In PDF document text
    • http://files.joyfullittlecatholics.com/uploads/1/3/2/7/132712661/57601badb7e21b5.pdfIn PDF document text
    • http://wovotezag.projectvermont.com/uploads/1/3/1/3/131384281/9e20fb3a6c078.pdfIn PDF document text
    • http://kokiwelu.reidstellcounseling.com/uploads/1/3/0/7/130775085/nexefuzuwe.pdfIn PDF document text
    • http://files.allissfrenchbulldogs.com/uploads/1/3/2/3/132303170/bivuborow_kadupejutako_pidelikuwinug.pdfIn PDF document text
    • http://files.musictostopthepersecution.org/uploads/1/3/2/7/132741081/mopimitenod.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/1/0431/2888/1313/files/mugumapibaluma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5212/1762/files/wofumilepamufilalad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3383/5173/files/maintenance_electrician_job_description.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6770/2432/files/all_day_dining_menu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/sovura.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4402/7038/files/kuxidamoxoxediv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7521/5258/files/acrobat_reader_free_download_for_windows_7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/sosujeberufoso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/83162950838.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4311/8495/files/annemarie_schimmel_gabriel_wing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/acordo_basileia_1_2_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/94171073746.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5271/1581/files/zoraz.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_off000063a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A4 6024 bytes
SHA-256: fd20246ac3edf3b6f09aee324e6b38d45f8b312b563a7d4295f599e4deb81c4e
font_01_sfnt_off00007804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7804 11064 bytes
SHA-256: 0792b7293574513ea0b7ae3a028753d9c93365f7c224eb1efdc85e93373a864d

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