Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8dd3887a42da54…

MALICIOUS

PDF

45.2 KB Created: 2020-10-31 05:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b8b2d5e8eee9695f7e286dbee464159f SHA-1: 7ea53fbd299fb374afaada904268639821fbf437 SHA-256: ea8dd3887a42da54938feb868ed1e97e99f0d10049c83c3401d509cb08e231fe
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=question+answer+in+german In PDF document text
    • https://dodupezuvu.weebly.com/uploads/1/3/4/4/134443873/sejapakeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_5f95b326379aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5f8ff50068941.pdfIn PDF document text
    • https://bososafevibusup.weebly.com/uploads/1/3/4/0/134041518/8816864.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/1f32e4a8-96f6-4c68-9559-5154626b6466/xudukofixitako.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/52866221424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467448c9-1ca2-4595-a227-8631fa8d625f/viketubewakifumux.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/speed_and_velocity_worksheet_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/les_examens_biologiques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31b8e8a-9f0a-4bce-b964-581e75daa954/bogad.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/29708567423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a0ec0b-d236-449c-964e-e257cb463e7c/vajefosurisolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d15787-229b-430c-ac8a-7424bf11cf2e/3436682181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4492f499-af52-46c7-a145-462234b54058/sivagunineba.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_off000071be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71BE 5128 bytes
SHA-256: d7feff180cf01edc2bc4e6a7c43cae5b98b2e24deaa8c41a91b3eddabfa55d01
font_01_sfnt_off00008330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8330 10936 bytes
SHA-256: b5666ddcc586c98997b90448be29aa434725c0b0d1270f303e5d707b3dbbeec0

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