Malicious PDF — malware analysis report

Static analysis result for SHA-256 674d6dc463ba47bb…

MALICIOUS

PDF

43.8 KB Created: 2020-10-27 14:06:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8799d1e593b5d50fcc0b05d4a0864cf6 SHA-1: db8516964d7328c8930ef06e4cd5d41ee47f4fb6 SHA-256: 674d6dc463ba47bb3087c7844bbdbb1ae0b4b554126fea8772c09853f663ba89
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/strik?keyword=tax+returns+calculator+2020', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'tax returns calculator 2020', suggesting a phishing lure. The presence of numerous external PDF links, many hosted on S3 buckets, indicates a link farm designed to obscure the malicious destination.

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://cctraff.ru/strik?keyword=tax+returns+calculator+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f8fcd3f99ca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5f8a0b50aaf74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402246/normal_5f967029635c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f88668728a28.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/dezidokezapovujiluwa.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/2a0ea991ba.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kekikefuwu.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5f879e4cde90f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f92c95574c29.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/susopuzupure/83934412573.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/regevizin.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/neravimixom.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/wevenajuvireribanagijefo.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/45814976853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e545b1-bde0-4ae5-a25d-9ed70d9eb04c/gapopivuwefumodivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76578ef7-6c3f-4383-931f-5a0ebc33bbfe/cracked_phone_screen_repair_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a55906-f8d0-4c0b-9f88-2a173e04f523/98194396076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54865bd6-00c6-4397-91fd-82887859ec23/naxewifoku.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/74976646454.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/56034339735.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/86379834198.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_off00006dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC8 5084 bytes
SHA-256: 4cce625ae436a9cb6e99b47109af682dbc844009c3fda78a01283702ff943ca2
font_01_sfnt_off00007f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1E 10172 bytes
SHA-256: b2639ed0c21d92cd62278be73367869f1c6b30402f97da3ec7037e5551be9504

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