Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cb7fa82b02c3ee…

MALICIOUS

PDF

48.7 KB Created: 2020-10-30 19:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: acd934de413b38854b1364356ab93d02 SHA-1: 2310b2335c79feca3ba59d621e6bd7c9c246c69c SHA-256: a3cb7fa82b02c3eee9522b76e2c9453d7fa39344681b34294e22563346d3ca61
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable hosting or known redirectors, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and one of the embedded URLs, 'https://gettraff.ru/aws?keyword=rory+gilmore+reading+list+spreadsheet', is identified as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=rory+gilmore+reading+list+spreadsheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5f909693bb9cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_5f8e7351721cb.pdfIn PDF document text
    • https://jelafabonopavu.weebly.com/uploads/1/3/4/4/134443296/refawesudafajejali.pdfIn PDF document text
    • https://wunimebi.weebly.com/uploads/1/3/4/3/134361225/walodakavewo_nakifixiget_dupuzad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5f985b6278fd7.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/zopugawarep.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/3250b5961ed1.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/simunu.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/xitukil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f9051ccae305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f989430baede.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/wolezojoz.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/658e3622f03381.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/gupuso/japibopanavenotiradu.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/senorodapurotekowi.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_off000075e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75E0 5484 bytes
SHA-256: 89295c454343fec427b8c2306410f010c7f7a29e90def0eaa74cc07d57e25b18
font_01_sfnt_off0000885c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x885C 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000090ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90EA 10560 bytes
SHA-256: 75b4ed27c70a6b324558530ef08667ff163f30d93d5c446ca7a93ba90d2b34f4

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