Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a52f5ed40e009d2…

MALICIOUS

PDF

44.3 KB Created: 2020-10-31 03:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 67c6fc7ff8f35464efc46ae9f8d1eba1 SHA-1: 12d5246b27f3f4015eba3a56dbc49c7a48fc65e3 SHA-256: 4a52f5ed40e009d2690591fb8287bb9670bca0996400e3c763f6a24a05c18eec
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are to other PDFs, suggesting a link farm or SEO poisoning attempt. One of these links, 'https://ttraff.me/123?keyword=clear+bowling+balls', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the embedded links and the heuristic firings indicate a malicious intent to redirect users to harmful content.

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://ttraff.me/123?keyword=clear+bowling+balls In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f937a4aedc42.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/425989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/6998/9573/files/microlithography_science_and_technology_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91bc227-d63e-45b5-8590-faf813fdb72e/antigone_haemon_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/cancionero_catolico_con_notas.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/33491824243.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/broiler_chicken_production.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/10948640946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f009e06f-7a30-4e09-b9d6-b7561a20aec8/luxewisikuxiwafodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1d1c46-c594-40b2-8ed3-46875f2d4865/43010383709.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4605/0714/files/79235521271.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/11420665901.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/where_to_buy_dmso_for_humans.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_off00006f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4A 4992 bytes
SHA-256: d15dc19f18808149f0715fe725acd7b326ceceac8c4cf945042ae204aa159b47
font_01_sfnt_off00008063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8063 10744 bytes
SHA-256: 091737dde4a649b1107807bafa3f338224a3d3e9b8b8faf171fcb758f8d085e3

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