Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf63881fc25874c…

MALICIOUS

PDF

52.1 KB Created: 2020-10-25 17:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7abed67ccdc641b218937121b0ed545c SHA-1: 399063592b8cfd4fac1616930ccf86228efabe24 SHA-256: 4bf63881fc25874c80ee4235252f0cc470a3fce28fb470f8c09d68d581ebd1b5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are designed to appear as legitimate PDF resources. However, one of the primary links redirects to a known malicious domain, indicating a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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/aws?keyword=angina+inestable+pdf+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f95724bd649e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_5f8d0b8ce9f70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f87808f0d324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5f8bcfa924a54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_5f9403bca95f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/foxit_editor_bookmarks.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/42130891826.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/english_grammar_book_bangla.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/79986821674.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/sovuwopa.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/definition_of_arthritis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3355/6630/files/novation_launchpad_app_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0055/1365/files/51096622738.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3967/7342/files/american_tobacco_trail_cary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c9c98f-ab7c-4c67-8116-f8a94cf1ec2b/xunapuragebaxotufizegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8454edbd-2799-4456-ba8a-d5166c644105/23988789436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c4bb79-0498-45f6-94ea-24df94bd3e8f/28791896077.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_off00008a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4E 5764 bytes
SHA-256: a45246d6d7bf11d6ca4bf8beb92a8bf339e2bc0133dd040ec3c0934c1ec504d0
font_01_sfnt_off00009dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFE 11168 bytes
SHA-256: 3b9ddf13c5cefaca72498c07d467108568ebcc513212415412755b1284dee3d2

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