Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc92ce4ebc900563…

MALICIOUS

PDF

49.4 KB Created: 2020-10-04 00:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3f65c2af20fc8c11cf45392dd9e692aa SHA-1: b79c88603f4e8a05624b36d1d3cbcd8fb098514a SHA-256: dc92ce4ebc900563fc22dac4993685078e2ab0e5f8e5debdeaaf3ab02e68800e
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=antecedentes+historicos+de+la+administracion+pdf In PDF document text
    • http://wazixosol.geoalpha.org/uploads/1/3/1/4/131407995/denifim.pdfIn PDF document text
    • http://files.maceymania.com/uploads/1/3/0/9/130969110/456054.pdfIn PDF document text
    • http://pajozu.saintceciliasingers.org/uploads/1/3/1/4/131482962/8082193.pdfIn PDF document text
    • http://files.sweetspotstrategies.com/uploads/1/3/0/7/130776619/lajasozewel_mezobozapumim_kolovelap.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/1/0431/5326/0701/files/69110331596.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6181/6727/files/xofipax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3069/1496/files/range_property_management_estes_park_co.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e6a263-8aa5-424b-84fb-fa53f422475c/jobowomezepar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56399ad6-adc4-45b0-a3f1-2392befe3801/73528173873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e41ac29-ec34-4a33-ac90-8801eda21361/muganofaferali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3d6b51-fdd8-4a7e-be16-744c5118749e/sidonapevufunorazuniwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3783/6710/files/hexxit_mod_listesi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/ethnic_groups_in_nepal_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/7863/1833/files/64786158342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1782/1605/files/divinity_original_sin_achievement_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/7098/8964/files/20491357804.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_off00008055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8055 5384 bytes
SHA-256: 8cf29bf9203ec092498bcc06046f7b444d8df9e8e1aec3f39e5f31d9ba2f5597
font_01_sfnt_off0000927a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x927A 11024 bytes
SHA-256: 54c4b09a7527db001ac11ded1013cd69a7627b46a9f244473cc8236572725e41

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