Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3024f8131a1ee69…

MALICIOUS

PDF

47.6 KB Created: 2020-11-05 11:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 627539f4ceb2a507379b3cf07a33ea05 SHA-1: a686ae149306b74d25ddd65fbe4064a9c87a92eb SHA-256: b3024f8131a1ee698b3763ab875c7c0cdd8eb18551a3a1209e02367c68ce9843
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/aws?keyword=cnm+accuplacer+test+practice+study+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_5f90021073d67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5f9d8413e4a47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388813/normal_5f9431913b54e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f8c64796492e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0070/1343/files/jofeturu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3fc2510-dd76-4616-b675-e07b0131ea8b/realm_of_darkness_kingdom_hearts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41cf7d39-1960-4290-a6e8-64483024386d/18872045016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d424be6-f79d-41ea-8721-1d4eeeeaacef/fobogodededimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb685c5-0b78-446b-b62a-b38bf1faf395/what_are_adjacent_angles_of_a_quadrilateral.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/worksheets_for_3rd_graders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e75549-e1bb-4b69-b568-3786f3ac4c05/97012788302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c514db4-cc1e-4283-a45f-9eebb999464e/zitafazonafitejoxebova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b1dc19-9ddc-4e7d-9446-4d6c2b20d43e/nivasenasanuzozaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe3e966-9c14-42e3-b66a-211838b45679/ambiano_pressure_cooker_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C81 5292 bytes
SHA-256: d49625ea72ececf914171da45b972d7bb39bc7da1e082f567b51273231e77842
font_01_sfnt_off00007e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E66 10880 bytes
SHA-256: 03feaf1754993e8e7c489a124f6e6e2e1ed2fd3db0ef5ce040a36903b718d5ed
font_02_sfnt_off0000a326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA326 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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