Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0491bbbb5a81c7d…

MALICIOUS

PDF

41.2 KB Created: 2020-10-31 17:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 17426d8ab02c0bf344fc79c99aa35287 SHA-1: bc4f808f2c7266b2cc5e890e0a9fd8ae1817b5b5 SHA-256: a0491bbbb5a81c7d80e7c2fe628a393a1c08d3f51ee4213917a807eacf6641ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector link to malicious infrastructure. The ML classifier strongly supports maliciousness. The document body, though heavily obfuscated, contains a URL that aligns with the identified malicious redirector. The presence of a link farm suggests an attempt 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://ggtraff.ru/123?keyword=blue+coleus+plant+seeds In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f89d1d9b43b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_5f973859b8192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_5f920ff8bd7f4.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_5f8d430af3887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_5f8ff2d3248d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5f97dfba223fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f88a60897f6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/encyclopedic_dictionary_of_archaeology.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/list_of_states_and_their_capitals_of_india.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7841/0136/files/mipajetoseti.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_off000063a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A6 5020 bytes
SHA-256: 3e04b7f006a60608cbaffbf213f0c58f99fb9cf8c40e6c4f039e397095b523f5
font_01_sfnt_off000074cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74CC 10520 bytes
SHA-256: 91a66397eac805c62ac1683e27b38c28862f9bda7cb82a04d33ff7102dec967a

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