Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec831a29f4db4966…

MALICIOUS

PDF

104.2 KB Created: 2020-08-30 04:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fddb78e30ce2734f340003a0ce403a03 SHA-1: 6f8091f094c551352d6eea00094d614da0a6e413 SHA-256: ec831a29f4db49661b50cbc393bf3df0a351aba8e8e59a082798d6be054121ea
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL. This suggests the primary intent is to redirect the user to malicious content. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a link farm, likely for SEO poisoning to attract victims.

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://ttraff.cc/wix?keyword=cheltenham+festival+of+performing+ar In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/lakezema.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8209/4494/files/java_programming_full_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/estudio_biblico_sobre_la_familia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1324/9946/files/vakitajoluwamud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/8914/1416/files/99771363652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7706/5121/files/85109300073.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/black_hole_charles_burns.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/powelob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3958/0575/files/zewezepakuxunotevig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3331/2925/files/mogijegefoxolun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9073/0405/files/61785900826.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/72741752435.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1995/9454/files/juzarepewinotesatu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015d28.bin
6a2f582c2979c904c0fba6b31ff52d5dc0cf51219f6c9eef008313986a0b5c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D28 5280 bytes
font_01_sfnt_off00016efe.bin
5f979ad8727286c46d737c55abeeee90e016f5bfd467462ca2291293bf59e784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EFE 10700 bytes

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