Malicious PDF — malware analysis report

Static analysis result for SHA-256 3455c1052dc88d80…

MALICIOUS

PDF

47.7 KB Created: 2020-10-31 17:17:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 30a242c0ba488c571fad45ba5fa6ff80 SHA-1: 411bc2cf0f4e76cb5a45f7e6fbf7a4a60a1d980c SHA-256: 3455c1052dc88d805e0a4bd23ec8500b8084e3bb3636fb5eeec3f61ab55f4525
154 Risk Score

Malware Insights

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

The PDF document contains embedded links, one of which, https://ggtraff.ru/aws?keyword=caballo+de+troya+1+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to "Caballo de troya 1 pdf" and lists numerous other PDF links, suggesting a link farm or redirection tactic. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/aws?keyword=caballo+de+troya+1+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jotizifime/iola_roberts_elementary_school_pell_city_al.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/bancassurance_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/brahma_purana.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/analise_de_dados_qualitativos_coleo_pesquisa_qualitativa.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/classes_in_python_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2587/3050/files/41002572256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba08882-1ac9-4d14-a13b-0f69840ed412/game_gear_roms_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/bacteriology_mcqs_and_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df070ea-7a74-4922-9700-7663c8efc3ad/jizuso.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/tasikipotukizamarada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c0877a-19a3-4885-9105-63bad63ee638/46585923253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e154f2-5f15-4fe4-8a6f-5bad907b9fea/29259746185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f78b91-830d-4f2e-8799-c9f2519d61f4/89250103808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be001bc7-3c3e-4b11-8f73-bff4e96df7ab/xapes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157f019e-fb91-45dc-ab40-b55523ac54cc/29591288345.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_off00007990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7990 5056 bytes
SHA-256: dbcc0233d28df39367f917763687cec1ed2730d9ead760efde613281e2d9e9d5
font_01_sfnt_off00008ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD2 11588 bytes
SHA-256: 76020c5a68d180be6f2017c69c1b987f759d8e28b48849925010b4e7e6ed50c4

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