Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8cf5b7b444edbc…

MALICIOUS

PDF

48.4 KB Created: 2020-11-03 19:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 849ebb8f5cc6edbc12fc067287337367 SHA-1: 30d0dc377170b213f5549c76f9a177bc192dcbb9 SHA-256: ef8cf5b7b444edbc24dc5a1a4b00870b681bb15adfccac3f46131ef5229a34ce
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, specifically advertising a 'rainmate air purifier scam'. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a phishing or scamming attempt. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=rainmate+air+purifier+scam In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f9870caed96a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f9fb58b27c7b.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/8e42bfb8d1b0f.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/felizoladizaganulex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f977815466cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_5f986a1a8b14f.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/xatem.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/gogonof/oblivion_game_of_the_year_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/building_construction_cost_data_2014_book.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_off00007e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E32 5136 bytes
SHA-256: 22a2a9077a05a98501d21fff6dc46d3d3cad15885ad7a97ab7c8c048c1fd10a6
font_01_sfnt_off00008f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9B 10996 bytes
SHA-256: 15d89aa2431098dd4c8bf7e32aeb1d46db1f2c30b4adcd2c5d6ab6e2942b52be

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