Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4b1b87ee10045c…

MALICIOUS

PDF

51.9 KB Created: 2020-09-08 00:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3fd27afe7ad99b77d5bffd5198de5544 SHA-1: 67982eb0385859f1d90b5ae7cf62bfe703ae7445 SHA-256: bd4b1b87ee10045cc666cec0a41004a361fcc0981e1c8bf321029a29f4412dfd
194 Risk Score

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/wix?keyword=algorithms+illuminated+part+2+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/4542d9_81ce6646c5c744fb97f60e5b10cb874d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/16a96a_651f9dbdd86f4fe298567ad516639e61.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6f9b04_985ec1f2d8b548b5ad6153f7a5c138d0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8bbd7_771375b0e9214114893da29b167ee3a3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/59938509726.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/spatial_iq_test_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6590/1210/files/90581326456.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9983/2995/files/30445763265.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/conveyor_chain_design_guide.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b914b5_767c38917b8e4e0c9c935b840cc77193.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3f8d85_51bc24fa3a72458fa6e66d12f3289724.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7c41c1_d14708b45982487b9d345958657ce0c6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f46427_13b918aaaa6a4e2998ab756753f88fd5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0d9a50_114475abdbb840b382f5551083f69737.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/909b15_9a9aa3e1700d49dea2ad96764422344c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/57c819_40228d4a25d24c9d8934f4b06d729e1e.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86DF 5576 bytes
SHA-256: 4d7cd9fedfbc393427313fe7248da7f1a608504b4b7765ce5f79692dfdb67c1f
font_01_sfnt_off000099b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99B1 12496 bytes
SHA-256: 82347898cccdd7c07f56f523b7fd8d0fac605ddbd98f5f19ea028a0fc32e0189

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