Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31a574a01829024…

MALICIOUS

PDF

44.3 KB Created: 2020-09-30 13:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 68cff4c50bc40e98a33e25436c7e4f8a SHA-1: 328f82250be11642604686917ef31bc93ea23b49 SHA-256: c31a574a018290245071944d9d49e46e8986dbfce9c8c3cb9226a0c5cd17b02b
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://ggtraff.ru/strik?keyword=periodic+table+of+chemical+elements+impact+on+human+welfare+pdf In PDF document text
    • http://files.caradunning.com/uploads/1/3/1/1/131164556/5763c0365d36b1a.pdfIn PDF document text
    • http://files.dreamsnseams.com/uploads/1/3/1/0/131070105/83252.pdfIn PDF document text
    • http://fezezogim.cambridgesupervisiontraining.org/uploads/1/3/2/6/132681337/divef.pdfIn PDF document text
    • http://files.promoteteaching.com/uploads/1/3/0/7/130739218/3467661.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4be064-c0d0-467c-8872-10c694548711/kipewozegot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4610/0374/files/acs_applied_energy_materials_impact_factor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7917/2257/files/89115947763.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5407/9910/files/maplestory_m_hacks_ios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4474/7929/files/2406803199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/56033185084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45311bc1-1eaa-4ef2-b34e-f1a9ced0ed8d/54936757137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48280417-1686-4b6b-a1d6-57a6cc742023/57898804120.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_off00006e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E41 5628 bytes
SHA-256: b88916bb1f148011bf87ea4e759cee3f56a4a908719623fcbd719263447179e2
font_01_sfnt_off00008144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8144 10136 bytes
SHA-256: f90a9f09ab50b1882eac296d93f41c2ae608324435850d0d085f6bef1c271603

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