Malicious PDF — malware analysis report

Static analysis result for SHA-256 0961d33ea143c3f7…

MALICIOUS

PDF

58.1 KB Created: 2020-08-08 12:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1b87fd67e5d6b256ae2bb7cd9a85f210 SHA-1: 66bb2d3046f3ff51bb54bac186bdc113c1e6d4ca SHA-256: 0961d33ea143c3f76faab363feeb0e27c2d9b50312ff427b4428dbbcaad2ff09
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to a redirector service, which in turn links to various PDF files hosted on Shopify and other domains. This indicates a link farm and SEO manipulation tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links suggests an attempt to obscure the final malicious destination.

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=assembly+language+projects+pdf In PDF document text
    • http://files.deliverydoula.com/uploads/1/3/1/4/131406258/neberobujupubal.pdfIn PDF document text
    • http://files.armycadetsofamerica.com/uploads/1/3/1/6/131636745/98f6c90c.pdfIn PDF document text
    • http://files.cls-asia.net/uploads/1/3/1/4/131454436/77f72560d5.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/1/0430/6622/8898/files/86593694788.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5799/4138/files/vuxabezinovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4020/9056/files/38405728650.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/84869384063.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/convert_to_word_text_ocr.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/the_afterlife_gary_soto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/gastrulation_in_amphioxus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/laposabimi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/jilaxifosozaxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1088/2727/files/43746747156.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/11623363696.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/buzinamedogosuxumi.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
🗂 Part of campaign: cls-asia.net 3 samples

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000897c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x897C 5780 bytes
SHA-256: 16c6304c22530995495100927d05155189961e579a97484a383e9a42da6f07de
font_01_sfnt_off00009d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D17 1952 bytes
SHA-256: 157a80d2d50088e36b2a5e1071e60f2fe9e71d3118812aed6f9bb3bc0a03b7b0
font_02_sfnt_off0000a678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA678 16568 bytes
SHA-256: dc3a1d57006ae08148a812107f895aaab654da371141e7c717a83c343e028504

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