Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2558f2505a9047…

MALICIOUS

PDF

55.6 KB Created: 2020-10-29 06:35:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: a869fc6ce5cb406639362215a7359648 SHA-1: da43f0b80e5b80478d697d21612254ea695a35fa SHA-256: 4d2558f2505a9047dda190557a84bbb020930996b843b303474dba3556659adc
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to attract traffic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is intended to redirect users to harmful sites.

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=skyrim+dragon+rising+quest+stages In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5f99dde2d3f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5f928368a980b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f86f46d97368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_5f9a3cbf29e92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5f95850aeeffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_5f8ed4052112c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f88ad4f23447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f8c196ab8e64.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/1/0435/9038/5823/files/handbook_of_financial_mathematics_formulas_and_tables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0abbdb-4581-41b3-97e4-854535761bbe/nasokalivokedutagig.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/clinical_pharmacy_and_therapeutics_roger_walker_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/ascii_hex_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb6bd62-0381-4b64-a8a6-c3464582c57e/accounting_for_small_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9945b4ed-4b08-4ec8-916d-103acfb6dcbf/wipeditinuf.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_off00009711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9711 5508 bytes
SHA-256: e093d64c5b6a48f6b07d4117c7b5616e93a1e9f031a32d9c277cc0f0c78b7220
font_01_sfnt_off0000a9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B4 12732 bytes
SHA-256: 47ee6379ae404df9a9744128633716051dc18c75c7d0081d237eca8a99a2024e

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