Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3fc5cd157818c5…

MALICIOUS

PDF

42.9 KB Created: 2020-11-05 22:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: aec09dc87492946d31008e4cdbb29a74 SHA-1: 16d2eacaf9262db068b278118729166a9df8b42b SHA-256: 6f3fc5cd157818c5afacd9b39552f98d176bc9c564c9ec39c4274e0cee712757
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is 'https://cctraff.ru/123?keyword=isoftstone+search+engine+evaluator+test', which likely serves as a gateway to further malicious content. The presence of a large number of external PDF links, including one to 'https://uploads.strikinglycdn.com/files/f46f127d-2de4-4989-bd6a-d1a534cba74d/vovateruw.pdf', suggests a link farm or SEO poisoning attempt to distribute malicious 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://cctraff.ru/123?keyword=isoftstone+search+engine+evaluator+test In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_5f8ca4f998ca8.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/f46f127d-2de4-4989-bd6a-d1a534cba74d/vovateruw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3565/0969/files/55830651573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8cf0d9-6bae-40bf-bbfd-b585b3029019/samsung_wf448aap_xaa_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/kepatabutagaraxeparuka.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/92811983923.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/estilos_de_aprendizaje_visual_auditivo_kinestesico.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/blending_words_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/83090561413.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/descargar_certificado_medico_oficial.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/sally.exe_creepypasta_remake.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/jakotofu.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/words_into_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d58fe21-7f9e-4d17-83ff-ce3fbf297301/pujatukigo.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_off00006870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6870 5140 bytes
SHA-256: 1c6e8507da8eb6d99ac1fc77ab97b784406bc657cd35973f408559850b108dc8
font_01_sfnt_off000079f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79F9 10852 bytes
SHA-256: 514a243e0068acf246b1cdf3ce8724ec8aba897f9e582cd9494901347275d606

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