Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02fa1a2142d29af…

MALICIOUS

PDF

50.9 KB Created: 2020-11-01 21:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b6160a86b6cc7f754d4e5c1085ffdf6a SHA-1: cb92d02872c9ecf69f25bdee5545dd85eee6d3ef SHA-256: a02fa1a2142d29af74945b32b3fa4abab560eee6a778ee84783527598d4ff337
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URLs, including the primary malicious redirector at https://cctraff.ru/aws?keyword=homemade+ro+for+maple+syrup, are intended to lead users to potentially harmful content. The ML classifier also 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/aws?keyword=homemade+ro+for+maple+syrup In PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/jobogoxov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5f9ccd659cc1e.pdfIn PDF document text
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/poriturovenida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5f9b0a17da44a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f893bab400e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/forgotten_realms_deities_3.5.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/one_way_anova_example_problems_and_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/antitumor_antibiotics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f301b4-49f4-47f6-8afa-b42b938831fc/nepodene.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/belzona_1311.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9690/6174/files/46401307710.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/magnum_contact_sheets_book.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_off00007a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A87 3312 bytes
SHA-256: 64f8a037a867ad03afc82778a9dd29555743dcd7f73173cb13a1fd3d9537c206
font_01_sfnt_off0000866e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866E 5248 bytes
SHA-256: 8c49c8d90310e9bce445d1f77803319fd6cf378a082cdb908c7c923c905a4f11
font_02_sfnt_off00009835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9835 11176 bytes
SHA-256: 9d94ee0068e51b6f3bfa7e7eb53150183d03b86b04479d7f8a1c2a795c3dc9bb

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