Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c171179e37d034…

MALICIOUS

PDF

40.6 KB Created: 2020-10-31 17:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 3109f52b78c7ee4688ddf31da302e3ed SHA-1: fc83cf5b5f722e89f9f27e9523bba8859a1e7f2c SHA-256: 98c171179e37d034ee11e0383fcdf108b93a8f24347d23ce741be3eafb7a4a0d
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'birth certificate' and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also strongly indicated maliciousness.

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=birth+certificate+los+angeles+cesar+chavez In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5f96ddee87c6f.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/7922058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f8819f2cdda8.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/1/0502/7758/0973/files/92253349021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4202/0769/files/employee_handbook_acknowledgement_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9863/4915/files/what_to_put_for_desired_salary_hourly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86714517-95ef-4c2c-a7d0-00684537e15f/xabefakuxafozovoritemubi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5689/7434/files/98692233245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3264/1180/files/54100095021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0767/8915/files/nodenamolejikaz.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_off000061b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B3 5304 bytes
SHA-256: da7b7abbe74ce064368690d664f014f52528323e0ea85ecb1ff4993428620473
font_01_sfnt_off000073d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73D1 10004 bytes
SHA-256: 7fe7fcbff086df2839dffb42c2666cf89ca50b229be211028d87e09ede6edbd7

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