Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cab5f32824de8b…

MALICIOUS

PDF

39.3 KB Created: 2020-08-08 11:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 972d9aa8a0d10765d23036fd1be333f9 SHA-1: 29b9a6c6476ec667b2abeb21ce5cfb25ad3154ef SHA-256: 18cab5f32824de8b350fd6fb15f95fdd85d067bd1cab589137a2dd150f2264ab
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.com/pify?keyword=biscuits+recipe+books+pdf In PDF document text
    • http://files.fengshuicertificationprogram.org/uploads/1/3/1/4/131406473/e268fb8e4431.pdfIn PDF document text
    • http://files.cycleecosse.com/uploads/1/3/1/4/131406650/sofegapanokojo-nixegifizoreji.pdfIn PDF document text
    • http://files.dzcstudio.com/uploads/1/3/1/0/131070859/tiwivebovelax-kifebejuw-zaruwonepaw.pdfIn PDF document text
    • http://files.cmenergyinsight.com/uploads/1/3/1/6/131606284/gobemukumemunitogi.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/1/0448/0398/1463/files/greater_than_less_than_fractions_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/29063474293.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8341/5204/files/33141842549.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3022/3775/files/38924428916.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/soladedolabaduporu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5480/9759/files/psycho-_cybernetics_updated_and_expanded.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/3171/9070/files/anthroposophy_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/24381309196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/lapenilasabomoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7186/4993/files/demujajop.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_off00005c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C81 5160 bytes
SHA-256: f63bac76b16c0bafc2fd2afd925493dae694370161ffc8f8bc5303d6e360a38f
font_01_sfnt_off00006e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E22 10072 bytes
SHA-256: 4710b89c860e099475457cfde637d16dba205ab068402e1ed2959e8e6bac09fc

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