Malicious PDF — malware analysis report

Static analysis result for SHA-256 9371fbfc565668ea…

MALICIOUS

PDF

46.5 KB Created: 2020-11-03 21:24:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7159085b651c3820b348050a26393be1 SHA-1: 97f893da24c983d7cd4fb9e06856404791c8a09a SHA-256: 9371fbfc565668eab95e6bd012a0b1efc4b23f3a121a9d21d7690527e38b012f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://cctraff.ru/aws?keyword=vanilla+tailoring+guide. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF documents. The ML classifier also strongly indicated maliciousness. These factors suggest the document is designed to redirect users to potentially harmful 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://cctraff.ru/aws?keyword=vanilla+tailoring+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_5f9613808e2c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f983b186a10a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_5f951a26ccf74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f870bb580dee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_5f9a1cb4561b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f8a41bdaa22f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5f8f94ba542f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_5f9c9a60b17fd.pdfIn PDF document text
    • https://lowijagaji.weebly.com/uploads/1/3/4/3/134394878/niguvomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424025/normal_5f97a225c4bf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kibavutibeved/bonidumimutomazeziserujat.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/fusionner_2_avec_adobe_reader_xi.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/124420068.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6977 4664 bytes
SHA-256: 82e2f2c403f6d746e431b6c5a7245439f9e3e530ade3aa780eede7405600e9f9
font_01_sfnt_off00007955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7955 10996 bytes
SHA-256: b01870463d5b9b8ebee58066097e992b7330b7c7223a05c70e87a07c0391f798
font_02_sfnt_off00009ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDE 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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