Malicious PDF — malware analysis report

Static analysis result for SHA-256 2023859e89671037…

MALICIOUS

PDF

41.5 KB Created: 2020-10-13 11:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2defedb490c1418c4acc24a4e3b8b7d2 SHA-1: 5103715749f8011b68549784552800f738aeb94f SHA-256: 2023859e896710370fe9d6044ea8d42264bb57b7155fbb7b867bd5ca9f43d2aa
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=baixar+netflix+gratis+para+android In PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/tixobenudofezibet.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/lixavej_rivutavipulox_vunezikavad_lirumonoguwako.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jasamejug-jenutuzudemeluf.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dbbd04.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/1/0433/2191/7598/files/45827401912.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/4832/1183/files/kuxixopamunaxesomekek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6630/2359/files/situational_leadership_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/3196/8155/files/en_los_zapatos_de_valeria_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6525/2769/files/medtronic_lifepak_cr-t_aed_trainer_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8042/1018/files/19086517241.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2038/2118/files/marriage_a_la_mode_katherine_mansfield.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/sutajopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3290/2806/files/80616890566.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4145/1932/files/75802839303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/9803/0485/files/groundskeeper_2_rake.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_off00006427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6427 5324 bytes
SHA-256: 66c665495920f7a84ef12de2f54c00d7f679e74cc95754978e314a86c030c4f5
font_01_sfnt_off00007657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7657 10208 bytes
SHA-256: 7048a032596724d2e4b2cf0347915c83daaa0fa5702d8b8fa458242315775272

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