Malicious PDF — malware analysis report

Static analysis result for SHA-256 63199838341f0cd9…

MALICIOUS

PDF

39.0 KB Created: 2020-11-01 12:33:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 07c1c58d30d65c7c1182fce52f1b4f22 SHA-1: 78cf637be819eafd8e74d93e2048aba0ffba45d5 SHA-256: 63199838341f0cd933d6c0a53a6700737689c458246a74876093826a76a0b4d3
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ggtraff.ru/123?keyword=gta+vict+apk'. The document body, though heavily obfuscated, contains references to this URL and appears to be a lure for a fake application download. The presence of numerous other PDF links suggests a link farm strategy to obscure the malicious destination.

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=gta+vict+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f870ec6788b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_5f93d03a55bb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5f9d07da339c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_5f8d278291b69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f9d627453b9e.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/kevava/attestation_d_employeur_destine__ple_emploi_vierge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8645/3663/files/howls_moving_castle_book_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8795/4073/files/35069304860.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/22028738540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9560bf3a-e30d-42e4-8582-20904635c9a6/13821002064.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0879/1994/files/videwu.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/retuxobutobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2454/5430/files/filazoremawul.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_off00005b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B06 4776 bytes
SHA-256: f2c0866ca9568c7145123695e0f794c5d839662fe4fc61b619aae74de47b9d9d
font_01_sfnt_off00006b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6D 10904 bytes
SHA-256: 4b6dc09ad9277c06306e1cd0d84f18d22b190c18298c5c128faa9a728353336f

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