Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b7ef14bfe8229c…

MALICIOUS

PDF

42.1 KB Created: 2020-10-29 20:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 59e2b8628e1bfef71a039ff154fdf2fb SHA-1: 1a643cc617c126c2a14633692a6c09a5554c7e00 SHA-256: a4b7ef14bfe8229c27a3027bf0e131a63a5d87c471805cd0936ee35187e04e03
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to known malicious redirectors or are part of a link farm designed to manipulate search engine results. The primary malicious URL identified is 'https://gettraff.ru/123?keyword=high+school+spelling+bee+words'. The document's structure and the presence of numerous external links suggest an attempt to redirect users to potentially harmful content, likely for SEO manipulation or to serve malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/123?keyword=high+school+spelling+bee+words In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407777/normal_5f92559f8a22d.pdfIn PDF document text
    • https://zakiguranul.weebly.com/uploads/1/3/4/4/134480990/tibiniwijimuza.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/b7aa7bbc-a811-4788-b128-58ce5d77c144/poemas_de_ni_os.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5de3634a-f2b3-4a0b-a060-9c6e93b2a0e5/wrong_side_of_town_cast.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6283/5368/files/procare_medical_transportation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28f239f7-1ee7-4587-804b-d439a45b5507/kuta_software_graphing_lines.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/15783475692.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7568/0405/files/74291396874.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/29889391689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bded4f0c-609d-42e5-95e3-b48e7ac9c91a/99886828963.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_off00006679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6679 5320 bytes
SHA-256: dc7b1c25065fede6a06193b19f65af82843fe601499c1fbcf01e1a461328f7ec
font_01_sfnt_off00007898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7898 10340 bytes
SHA-256: 6764b262b83548508b8f434de8d44eb337a8e3cf38f4a3e4b1bbe6da2caea131

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