Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a9e30adbf5a861…

MALICIOUS

PDF

42.7 KB Created: 2020-11-01 20:57:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 900e28e4e7ef2304124a70af0466a49b SHA-1: 1e34c81274102afde465fc90c5684c1ff3178468 SHA-256: 90a9e30adbf5a8611bd316901d83e03aacb6e94f85ec87886c11ba327c80632d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure related to Steam gift cards, directing users to a malicious URL. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this URL leads to known malicious infrastructure. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents, suggesting a broader campaign to distribute malicious content or engage in SEO manipulation for malicious purposes.

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/123?keyword=steam+online+gift+card+code+generator
    • https://cdn-cms.f-static.net/uploads/4420224/normal_5f9b0ae776cd7.pdf
    • https://cdn-cms.f-static.net/uploads/4394071/normal_5f9d40923b921.pdf
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5f95c5a47ff22.pdf
    • https://cdn-cms.f-static.net/uploads/4414159/normal_5f9cadcaec636.pdf
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5f93c81fd21a7.pdf
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/dutoz_tixobegeloliwa.pdf
    • https://cdn-cms.f-static.net/uploads/4392462/normal_5f8e43cd348a3.pdf
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/98390635.pdf
    • https://cdn-cms.f-static.net/uploads/4383322/normal_5f9109ea9ea94.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/29bd9672-c609-47ec-b9a2-660e441f5db4/15779356543.pdf
    • https://s3.amazonaws.com/subud/product_of_multivariate_gaussian.pdf
    • https://uploads.strikinglycdn.com/files/fa9d9c74-488d-4f69-87db-8f7127668a4b/ralev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006682.bin
c76200cce6b1e1efe13c2ad5187e164a84bedd45705c7bd06bbf68d9ea7feb69
pdf-font-stream PDF embedded font (sfnt) at offset 0x6682 5268 bytes
font_01_sfnt_off00007857.bin
2ef9fa950f0ecbb00950d3122924c67fb929956d5988983040c439ae4fcd675e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7857 10992 bytes