Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b7dc2f5e392688…

MALICIOUS

PDF

38.5 KB Created: 2020-09-30 06:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 17c673eeff33b1564a679cbc035ab298 SHA-1: e8a2fcc72055cad2271fd3cc9a0e01e064416b62 SHA-256: 34b7dc2f5e392688ccdb554a7546001fd40e85905c0daa8de3a9e5db5eb34061
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. It also features a large number of external PDF links, many of which are to benign Shopify URLs, suggesting a link farm or SEO manipulation tactic to mask the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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://cctraff.ru/strik?keyword=vcf+to+pdf+convert In PDF document text
    • https://site-1036861.mozfiles.com/files/1036861/48252701525.pdfIn PDF document text
    • https://site-1037241.mozfiles.com/files/1037241/jikozugowipixipufovida.pdfIn PDF document text
    • https://site-1037221.mozfiles.com/files/1037221/nezekepulapofagomupuzu.pdfIn PDF document text
    • http://ziwoterow.nicolettegraceboaz.com/uploads/1/3/1/4/131437229/5375071.pdfIn PDF document text
    • http://vejexol.jeffersonhighwayinoklahoma.com/uploads/1/3/1/4/131454526/2871595.pdfIn PDF document text
    • http://nujuva.scoresgrill.ca/uploads/1/3/0/7/130776886/0053e2b5c7.pdfIn PDF document text
    • http://sesivux.kingfisher-strategy.com/uploads/1/3/2/3/132302868/9874854.pdfIn PDF document text
    • http://files.amongthewillowwagon.com/uploads/1/3/1/4/131408928/bitanibafu.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/1/0433/9807/0426/files/bio_data_form_for_job_application_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6453/6471/files/tonenusuzilegedunuve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3480/4375/files/74223918954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4783/6065/files/wifi_password_hack_v5_apk_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1638/0831/files/kenwood_excelon_dpx791bh_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6659/7269/files/nojatowufamesukuruxap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5883/9203/files/37493890395.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0728/2847/files/wugaduwititapetefinikoba.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_off00004d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D0D 4492 bytes
SHA-256: 4b8b7db0a8a2aa69b626a7cbba637d69def7efd10f8caf241c9f86e15c0a59c3
font_01_sfnt_off00005c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C55 10288 bytes
SHA-256: 9aaaae04f62e89a9bad0703fe22d49b6a3117ccbac604a4ebc6585df9c3d77a0
font_02_sfnt_off00007f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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