Malicious PDF — malware analysis report

Static analysis result for SHA-256 431e14386c28b135…

MALICIOUS

PDF

34.1 KB Created: 2020-10-02 20:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bae8c5ae95f248abbf969daa6712de4a SHA-1: 90eb5616bc3eaed178316711073bc1ea6f894bd6 SHA-256: 431e14386c28b135d500adb2f7a9188d5cc10c3b6221c9971196953e205b6c8b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. It also exhibits a PDF SEO link farm pattern, embedding numerous external links, one of which is identified as a malicious redirector. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the embedded links are the primary attack vector.

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://gettraff.ru/strik?keyword=la+gaviota+y+el+gato+que+le+ense%25C3%25B1o+a In PDF document text
    • http://files.newmtmoriahamejax.org/uploads/1/3/0/8/130814868/bejumalofel.pdfIn PDF document text
    • http://kawero.elliottpta.net/uploads/1/3/1/4/131411896/moviparemo_bololugata_tojubiwowa_wowuxuvopamimo.pdfIn PDF document text
    • http://gejoven.creatingyourwellness.org/uploads/1/3/0/9/130969130/xuxoroluki_felux_fitiv.pdfIn PDF document text
    • http://pexuje.artistonabike.co.uk/uploads/1/3/0/8/130815017/fukatixeraj.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/729977a1-ff63-4cb8-98b6-582301a46339/tofet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f22031c-86b5-4f7d-b572-4ad958d8b5c9/84541422378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ac8a99-a24c-4e25-8829-4db63f903055/rotufumiduweni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe1cb95-95e8-401e-9c10-aadbd7a0b36d/37234762594.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/9817/7181/files/termites_or_ants_pictures.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1398/6714/files/evaluative_questions_reading_comprehension_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8605/2504/files/nuxupakeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e34c1e-1556-4385-acdb-25e9f1336477/66277417821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/386ea6a2-cf6a-49b1-a320-1a7e3ffed068/ximukopefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf77fa6-fcd6-42b2-843d-ff1104fa696e/lukazimamikunojipusuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4475920a-1a99-479b-abc1-cd02c7db0c5d/47726953154.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_off0000465a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x465A 5200 bytes
SHA-256: 6820ed73c1b429376242f83868c6ac44780d0bc4110a7a85a28d9ad19f1f8235
font_01_sfnt_off000057ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57EE 10380 bytes
SHA-256: 760351d1236cc44be9dcba49b2ccd54ae981351c0fb4b71ce4e715301c4a5128

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