Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a1d9f9edd6bb5e…

MALICIOUS

PDF

47.3 KB Created: 2020-10-03 19:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 9cbc3f40a671699c161c49a73d4f1b85 SHA-1: 9b44aca9e31fd6fb0438327d24c02fc8a6017bb8 SHA-256: 77a1d9f9edd6bb5e7045ca89d4a6c03b037b116551721992349b75da72dd0c76
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://cctraff.ru/strik?keyword=samurai+workbench+plans+pdf', is flagged as a malicious redirector. This indicates the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the embedded URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic strongly suggest a malicious intent.

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/strik?keyword=samurai+workbench+plans+pdf In PDF document text
    • http://files.botanaorganics.com/uploads/1/3/0/7/130776499/3723279.pdfIn PDF document text
    • https://site-1036750.mozfiles.com/files/1036750/posajarogaveridabol.pdfIn PDF document text
    • https://site-1039329.mozfiles.com/files/1039329/64713813820.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/1/0429/9869/4042/files/stimulus_diffusion_definition_define.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8535/2100/files/sql_cookbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/lillys_purple_plastic_purse_activities.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0420/9569/files/13867388595.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8185/0268/files/refraction_gizmo_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2028/2774/files/navy_ppme_course_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/grant_cover_letter_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/unidad_2_etapa_1_ws7_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0461/9684/files/homemade_jalapeno_ice_cream_recipes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0191/3759/files/prentice_hall_algebra_2_chapter_3_extra_practice_answers.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_off00007add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADD 5792 bytes
SHA-256: c99b50c27f48855b5afabaff177fc1317c86da683024b0f1a317347026b8ead2
font_01_sfnt_off00008e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7C 10008 bytes
SHA-256: 418e4aa6cb29ab86f4334ed60485623de6eee97da5d9c98e3bd9d61e336d0db0

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