Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4b676814962435…

MALICIOUS

PDF

37.6 KB Created: 2020-10-10 08:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 108ac2170f89b846f91dec3ae5e2722f SHA-1: 80fa46335400f99c78af984205ec7bcf42596296 SHA-256: ff4b6768149624353ca498a47f3037c8e4ee1ffd22ce2e4f6e897b5c00890a80
94 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though obfuscated, contains strings that appear to be URLs, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=richland+county+recorder+of+deeds+sc In PDF document text
    • http://files.mcloughlansupplies.com/uploads/1/3/0/9/130969791/7694016.pdfIn PDF document text
    • http://files.theemptyhandbag.com/uploads/1/3/0/8/130813667/tugobonovagabara.pdfIn PDF document text
    • http://files.mayolivestock.com/uploads/1/3/2/6/132680993/6593831.pdfIn PDF document text
    • http://zelirozas.lifelabnotes.com/uploads/1/3/0/7/130775350/muduve-linikumulofamow-jerujaro-bikaruxebitizo.pdfIn PDF document text
    • https://site-1039182.mozfiles.com/files/1039182/40976896274.pdfIn PDF document text
    • https://site-1042940.mozfiles.com/files/1042940/likatonanodopogawesejako.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/25de67b9-f98b-43e0-817a-c8fcc722004f/45568306552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25af5b77-72a2-4d77-936a-92803012a36b/zamizokoripopasonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ab1ae2-610f-471c-b183-74dc13be6749/bukigubimovexujot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad209ec-a036-48e3-a6a5-5092125ef313/pelajinepexejixubimij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2b2d7c-25b9-4afe-b6a7-e1674b0e2374/55502016759.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_off00005562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5562 5216 bytes
SHA-256: 3bcc886902361ea31df6292af65dcaa968a49d69ae74d01c40ff2dc2ec8537bf
font_01_sfnt_off00006729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6729 10212 bytes
SHA-256: 94a3116d85b2d2d9e2f979c5f02f1b16e8e20d8fb8b07da4599a41916b2a77d0