Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3128b7cac7423d7…

MALICIOUS

PDF

52.3 KB Created: 2020-11-06 12:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ec36730cc4270951e708e4585ccc3d69 SHA-1: 110acaa3f05459c827042e631ac46117f1c3e042 SHA-256: d3128b7cac7423d755f544a0f19ec8dc7065fce6e9a2dbb9811fd05f1bcd89a3
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at 'https://traffmen.ru/aws?keyword=epidural+anesthesia+ppt'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious content. The presence of many external PDF links indicates a link farm strategy, likely for SEO manipulation or to host further malicious content.

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://traffmen.ru/aws?keyword=epidural+anesthesia+ppt In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_5f9d4c53a5a74.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/43e14b223.pdfIn PDF document text
    • https://pulisojoperun.weebly.com/uploads/1/3/4/4/134487891/2654b54bdd1.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/9032382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_5f9a63b11a402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_5f95bd756e1c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f8705c8cd05a.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/2d5bbffc-7d35-46c6-bd2f-b81473e87324/33921021836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eef5c4e-3c97-477a-b938-9b52bf1d60ba/series_circuit_worksheet_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240473a2-591f-48f2-9d7b-44fe51b09d93/57659682776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e59d87-ec7e-4c4d-baeb-c271efc7be38/jaxab.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/lioden_hunting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a964ce7-f689-4874-bd06-76de0db83e82/31897212430.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_off00008cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC9 5004 bytes
SHA-256: 642ca99835a595fa5773dc1e0214470898a9f561a3e30c89497a76594af041fd
font_01_sfnt_off00009dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC2 11016 bytes
SHA-256: 088aeeea3f57e0c8b9214297b878bd899b76aeb87b4fc8b8727e2fa2dadbd8b0

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