Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa91c34a9ca4d3e…

MALICIOUS

PDF

54.6 KB Created: 2020-10-26 09:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 54a423ae79a849ac44936849ab59391a SHA-1: 3acb76b2860f0baa0220db4a19834273a088576e SHA-256: 0fa91c34a9ca4d3e9ab5879d5ae483a8b0b69ab2be4dfba7cedd867c358ca8f5
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to distribute malicious content or phish users.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=toxina+botulinica+estetica+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8d014540eb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5f8d46d11e522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f8b36e6927f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f90f477e8799.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/fusuzuzajot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_5f9619e24107f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382958/normal_5f8d32220a429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5f96064c75d1a.pdfIn PDF document text
    • https://ziwodenitisal.weebly.com/uploads/1/3/4/3/134350364/486945.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/kujemodulo_pizab_livofutuke.pdfIn PDF document text
    • https://kilesikawagex.weebly.com/uploads/1/3/4/3/134372597/2348516.pdfIn PDF document text
    • https://sodumixiseto.weebly.com/uploads/1/3/4/3/134311801/7eb397b5e8.pdfIn PDF document text
    • https://fisolaxarod.weebly.com/uploads/1/3/4/4/134471724/seloka_vofezijijuxer_kiwurogebo.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/roruj-fegedevovelere-zexomojikazi-rewubujelem.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/03eb8.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/6326761.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/172997c4-6591-4015-ae71-43481669c33b/90416302956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9396931a-e823-4b56-8188-643f62a7009e/90105712502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4565c11-5a3c-4f8f-bb69-d56a9bd4fd2e/48352082552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215a3e58-7827-426a-acc0-972cfa2d691e/90447267579.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_off000095f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95F0 5208 bytes
SHA-256: c5ca1df377afaa2de9c407aeaa71561b063204c15b99afca7b88622125635b30
font_01_sfnt_off0000a7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B2 11572 bytes
SHA-256: ae80ef5712e07130d0373e28674cc9a859e7184ec82feda81b93231a20b192ca

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