Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f628a0dc808657d…

MALICIOUS

PDF

36.2 KB Created: 2020-11-07 08:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6e12a30e1bc6ad77208c57f4d93cd224 SHA-1: 531699f1c9c607ebf352069e7beff91489b49584 SHA-256: 9f628a0dc808657de0961a74dec150f1347888a73ca413b8bb03581714d08a62
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, functioning as a link farm. One of these links, https://gettraff.ru/123?keyword=upstate+car+show+calendar+2020, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document's primary purpose appears to be directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?keyword=upstate+car+show+calendar+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5fa5a8721f369.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/1396268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383805/normal_5f905f1c16b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5f91302681925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_5f926663be2a3.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/bupoxegikifu_fenamijixogos_jimoxovume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://junevip.files.wordpress.com/2020/11/telugu_wedding_invitation_video_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/sixelunup.pdfIn PDF document text
    • https://panezij.files.wordpress.com/2020/11/bidotopojinedokugep.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/arduino_programming_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b6152b-9f10-4ee5-92a3-9c769b19de38/pavowixejegewas.pdfIn PDF document text
    • https://lukamukiza.files.wordpress.com/2020/11/54603052350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde174e5-2bc7-457a-88ed-2ce775e98f4a/bopuwax.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E46 5516 bytes
SHA-256: fc6777246e0950beaf0e5f4c3f180cc119fb665ab00058c323780e6fed3aa94f
font_01_sfnt_off00006118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6118 10376 bytes
SHA-256: cdc661552074a225eeb8bcedf46ac2a26277ea1894f83428bf4e5a5be7e68724

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