Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c94f085a8d57da2…

MALICIOUS

PDF

36.0 KB Created: 2020-10-03 18:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9e4e8ef64d7c4d9289ad14cba2e9df2d SHA-1: 84c3ac1e4da6b615ea3f909e256abf92e3084cac SHA-256: 8c94f085a8d57da2a3d10476114af664ba7ea3fc5f168300fc45797fee1c4294
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL 'https://gettraff.ru/strik?keyword=cuadernillo+de+silabas+trabadas+pdf', suggesting a lure to a malicious site. 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://gettraff.ru/strik?keyword=cuadernillo+de+silabas+trabadas+pdf In PDF document text
    • https://site-1038601.mozfiles.com/files/1038601/3143691546.pdfIn PDF document text
    • https://site-1039503.mozfiles.com/files/1039503/74866826546.pdfIn PDF document text
    • https://site-1036685.mozfiles.com/files/1036685/34755095704.pdfIn PDF document text
    • http://fokobobuf.photoclubofquailcreek.org/uploads/1/3/1/6/131606539/3425750.pdfIn PDF document text
    • http://najabivov.preciousinvestltd.com/uploads/1/3/1/0/131070197/ravuwe.pdfIn PDF document text
    • http://files.citysquarebarbershop.com/uploads/1/3/1/0/131070508/2646775.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b951530b-bfd1-4026-84b1-1f0996a5d836/54373233836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974bfa15-d55d-4bc5-83ed-39b2c2338706/13343186603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf4820d-5b2e-4a88-8b16-9a3785190afd/88821530283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d8125b-b092-4f31-aa2c-30e1b97a80e7/99796994963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74a5c2b-2f02-43be-ac2b-fd43dc75557e/23612394390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40ef357-d347-4de4-bd0e-20950da70be1/47903648978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2818147b-bd31-4dbe-b437-a4ba2d552429/57675361338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84caebda-9acf-4ea2-bb66-37799a55b18b/siwafoxawol.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_off00004d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9C 5080 bytes
SHA-256: 280f0a8904bdddeac3770148a39c144196fa809bc698d53da57509ddb513070c
font_01_sfnt_off00005ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE1 10676 bytes
SHA-256: 7a938ae992900764e585cd7548af038a4573ffd6e6dd3fcc9f9acf1ac7931f00

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