Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85f8a6e7be20274…

MALICIOUS

PDF

74.0 KB Created: 2020-11-01 21:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ff348febdbe0c8d07c77e7f18b31884a SHA-1: 7b9ca35d4737fe8d71cdf070746660358eae28d5 SHA-256: c85f8a6e7be2027459bb04e12196e3611092533afa3099e8fd5a5d159c751aee
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful website. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 3

  • 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.
  • 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=garnet+and+pearls+secret+rap+career+15+minute In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_5f8d31883d5bc.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/ab05b557-d012-4b5c-83d5-92792a49cda6/oxygen_not_included_farm_station.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6150f7-af38-42f3-8c03-23a8e60b6774/72841753449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d7b8bc-21f7-4c55-8074-16d5302a5ae2/bifinovisiwotizanes.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/memezusokirizidiriwunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae712d05-b395-438d-a4ea-1b1356452a24/jemeramobos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e8b5c7-9f78-4656-822a-0f2071d85005/63928479471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e57ebd1-53d6-4eef-bd40-89d4cf136604/5898548784.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 5428 bytes
SHA-256: e542e014f9e16bacb06df6d4af01f3e4761d06c01d7d2c4f961625a8bf8c7be4
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 10800 bytes
SHA-256: 2cf1e6871a2ed7f936fc2a57ad85a7b14f5046ebae6e03f62c15496a5f4ba5a6

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