Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b48a7ccd52b71e…

MALICIOUS

PDF

51.8 KB Created: 2020-11-07 12:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f61fe419500488dd6aee47be9d90288f SHA-1: bcca37d8f5afb1e5eab3870e4ee19b3ee9f08963 SHA-256: 28b48a7ccd52b71e79bf59608968639167e92531d514ff475aa9da6826651f2c
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a heuristic indicating it links to known malicious redirector infrastructure. The primary IOC is the malicious URL embedded within the document, which likely serves as a lure to a phishing or malware distribution site. No scripts were extracted, but the presence of a malicious link suggests an intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=proxy+site+2014
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5f8f53c08c639.pdf
    • https://cdn-cms.f-static.net/uploads/4392452/normal_5f8eb3ef34790.pdf
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5f87b22060b46.pdf
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/9485177.pdf
    • https://cdn-cms.f-static.net/uploads/4408853/normal_5f92dd034b93f.pdf
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f99e659da559.pdf
    • https://tozuxixawijere.weebly.com/uploads/1/3/4/5/134523333/a6dcb3bd6562388.pdf
    • https://cdn-cms.f-static.net/uploads/4384035/normal_5f8c9bfde2244.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://juvibix.files.wordpress.com/2020/11/wazasusegupaxusijip.pdf
    • https://uploads.strikinglycdn.com/files/2fc4f1ad-ab39-496c-a2e2-19c339ccc435/wusakawibufelogujurenumek.pdf
    • https://uploads.strikinglycdn.com/files/7697f822-ad84-49de-b84f-4a09dc758e18/dodimob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b9c.bin
a482257a12ef10fd30a8c988e9c9f43760551a02fc6ce65ad66f67261f42ae65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9C 5024 bytes
font_01_sfnt_off00009cda.bin
9a85a5f68cb485a69bfa55168d763f24a1d1ac6a0d4cf5445a3422c861806055		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CDA 11172 bytes

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