Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31ccb25c58836c0…

MALICIOUS

PDF

40.4 KB Created: 2020-09-30 23:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 06bce097a4c25d5e432a02e72fd62d6f SHA-1: 11192de870b2e9e7bcdba564dd3d5925477a9207 SHA-256: d31ccb25c58836c090b377e9efc892a286c76c22d1058e4386accc5404dbcd73
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://gettraff.ru/strik?keyword=algebra+tiles+worksheets+7th+grade+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into visiting a potentially harmful site under the guise of educational content. The presence of numerous other PDF links further supports a link farm or SEO manipulation tactic.

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=algebra+tiles+worksheets+7th+grade+pdf In PDF document text
    • http://files.foundationschristianschool.com/uploads/1/3/0/9/130969525/kefeme.pdfIn PDF document text
    • http://files.tomhall.org.uk/uploads/1/3/0/9/130969695/2270760.pdfIn PDF document text
    • http://vuxel.salonnova.hk/uploads/1/3/1/8/131871825/jukafunakabogu_benovajegizigan_begisu_ginufefujad.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/1/0427/5470/3526/files/gurejoviwugibirizaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/instant_vs_delayed_gratification_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6464/6042/files/getefozoxum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/76555901680.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4651/0490/files/jewijuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3159bff1-a68f-4292-93a6-c6ed127ae1bd/notituzokebosoxofeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c95fbf6f-18b3-4bb6-b13d-a321262c0894/22313952956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e825615-d254-450d-875f-9652fe7be1cb/puxexasibik.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_off00005e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E77 5668 bytes
SHA-256: e142dac7b038e22e3201ff8b9105343f10363c53e65ae674a3532af2a25479ec
font_01_sfnt_off000071d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71D4 10300 bytes
SHA-256: cfcf7d9761d147d7000f4979106fc5a70fbe5945d4cb4e85dd3be8c4691fff84

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