Malicious PDF — malware analysis report

Static analysis result for SHA-256 e158e504c7923994…

MALICIOUS

PDF

34.6 KB Created: 2020-10-20 21:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9952b618a01dd00fdf82a027f7613054 SHA-1: 5414b641df76dfd417e70e3d428cc386ae9a3951 SHA-256: e158e504c792399490fe0646f827611be511cc337c7a08f280123c7578f8feb7
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?keyword=k%25C3%25B6pek+sesi+mp3+indir+dur'. The document body also contains obfuscated text and a large number of PDF links, suggesting an attempt to manipulate search engine results or direct users to malicious sites. No scripts were extracted from this sample.

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/strik?keyword=k%25C3%25B6pek+sesi+mp3+indir+dur In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f87460c9d9d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f8d85b79abbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f8765a4425d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_5f8ec3614ca00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f872de9b3932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5f8b637481d57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f87ea0e26294.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/5612582.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/71cda4164198.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/1/0501/8127/5808/files/zoxul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3833/8972/files/nojekojuvateturova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/worksheetworks.com_magic_squares_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9936/3764/files/17279345545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8812125a-144a-4efd-929b-6020c2bd0b3a/fuliwaraxusemifiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf7f2ba-76bc-43d7-a44a-424759e4b3c1/80971035780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdec6f00-2ced-4e1a-88dc-3aaf2b76309b/duxanitibun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1cb924b-d38f-448c-bd60-6f04a8aba789/livapegikadezuweperufiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b75f771-69ce-4505-ae9d-d29415be369f/36543182238.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_off0000467b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x467B 5200 bytes
SHA-256: 614bb7a1c72eb425803ac6acdf444666e990c498222437b749ee1e0375e536f9
font_01_sfnt_off000057cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57CF 11376 bytes
SHA-256: 722672d9e9b7eef3d544c1640e7a9eb41480770905d67d9d01c2909801419674

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