Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfdf39d9731b78a…

MALICIOUS

PDF

44.3 KB Created: 2020-11-03 12:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a0c484d9a64f6c83998fecadf2bf0c25 SHA-1: 2a30eb03584c3c345e5d7faca3374c93a408b175 SHA-256: 9dfdf39d9731b78a8339dfb129bdbcb4c0c270b80d3f23d829b06afa39c7a0ca
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'word attack skills'. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm.

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://gettraff.ru/aws?keyword=word+attack+skills+pdf In PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/2640866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417049/normal_5f9ffe9867bdf.pdfIn PDF document text
    • https://minufagotokuwak.weebly.com/uploads/1/3/4/4/134489045/4668882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f9593f6dc372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f8b6d1d924c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/limewub/dazekuka.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/chess_books_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/fofedizod.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/topabalewopexuxujezoper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846c524c-91fb-4e7e-9c04-59925305e548/rafobigikowesedofegor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db621d3-604a-45e6-bed6-d05d105e87fe/80282790089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99404829-6039-481e-8d1c-453eb29d5456/2324470748.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_off00006e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E57 5224 bytes
SHA-256: b21a0afc286844b45a0ca672c3d09f9bd24335321abb22aee8b00f5566b70168
font_01_sfnt_off00008040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8040 10836 bytes
SHA-256: 8e04f3031bfd8c0111290f9322090fde77c678632592585c4ee4adf7230d8f20

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