Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc156a2245aec7a3…

MALICIOUS

PDF

42.7 KB Created: 2020-10-31 13:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9c1da9ee483ffcc833e8231a26a8662e SHA-1: d537869a835e1a733164d864629d1fb5c67b510b SHA-256: dc156a2245aec7a32a215402ff1e1256913fea4caa1f412cd9ae8491b13d45bf
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are likely intended to manipulate search engine rankings or lead users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attempt.

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/aws?keyword=creedence+clearwater+revival+travelin+band+bass+tab In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f93f69883414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_5f920b7517d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f9710e923991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5f8b95f231e33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f8c3a9d9036d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5f90ba0b563b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_5f93a9c2977cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8532/2158/files/31899261234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f184723c-a877-4b65-9f4f-efc8d5d9330a/somud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6530/8849/files/missing_number_worksheets_1-50.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2a9d21-03d2-4020-8c59-1dc643856a53/katyar_kaljat_ghusli_mp3_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9091/2442/files/cube_root_648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759503d9-84f0-4d97-b404-77e5a238e0f6/average_atomic_mass_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7416/4638/files/72642418450.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5859 4928 bytes
SHA-256: 9b8def7b755d0b0ba59dd752a32a1d48c2e8806b588149e0a2136dbdd08f069d
font_01_sfnt_off0000692d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x692D 11296 bytes
SHA-256: 96d839fed15742b86f5656a4d9ed5ca22678218fb61ef632686a17f9327d6a24
font_02_sfnt_off00008fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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