Malicious PDF — malware analysis report

Static analysis result for SHA-256 843f9a51b86d6401…

MALICIOUS

PDF

49.4 KB Created: 2020-10-24 19:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c8d6a94b5097b3e166fd2ebdacb855ff SHA-1: 38ea3051e1c01cd860c517a9fb3027b335b5e261 SHA-256: 843f9a51b86d640166bda42eee6270374ad6381f39586704bde4c93052d39ceb
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 the URL https://cctraff.ru/123?keyword=tinea+capitis+adalah+pdf. It also exhibits characteristics of a PDF link farm, with numerous embedded links to other PDFs, suggesting an attempt to obscure the malicious destination or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/123?keyword=tinea+capitis+adalah+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f87bdf37a917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f8ede9f31606.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/gatazezizujebap.pdfIn PDF document text
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/gurikosugok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_5f8f25bf3363f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f88be9202880.pdfIn PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/gudosesavuwota.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/8404466.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/f09ee181-be44-4cf4-a472-ac07a0816650/divigebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef8eb84-7a4a-468f-bb34-f28c21058258/sajufukagaxivewagomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41a56d5-f560-4b47-8526-d59e534f3b8f/28950167809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613bca4b-f5b0-4ab6-b562-ce242cb31e79/18154657182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf197f6-ee52-4bfd-afea-2249ac7b50e9/lakazinaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8d0b41-1a45-4844-accc-2d56eea54de8/jewifelepidita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07ed322-c569-47f6-bd5e-2985388b7031/4989948416.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_off00008248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8248 5096 bytes
SHA-256: 1cabf1a947d676ebb2bb8ed9aa2006383690759914011eff1b01d4bd601ff6f0
font_01_sfnt_off0000939e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x939E 11468 bytes
SHA-256: fa980fb7e23966342c1757d8c930608fa66a7fcc1fc282b5c0b360b0c71f1283

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