Malicious PDF — malware analysis report

Static analysis result for SHA-256 51167960b6c32eb3…

MALICIOUS

PDF

38.4 KB Created: 2020-10-07 19:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3e1abc4f094b4258da6a114b7a856259 SHA-1: 82194584bb018577e551e0c7633a4ae174d37a7a SHA-256: 51167960b6c32eb38c665c56063d8d77c58fa2ca3578cd94a147f0b16d24263b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=akademia+pana+kleksa+cala+ksi%25C4%2585%25C5%25BCka+pdf+chomikuj In PDF document text
    • http://files.westerhausmetals.com/uploads/1/3/1/4/131407281/tezirajitaxa.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/1/0484/9814/7483/files/xifesogepalimo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/soul_eater_free_x_reader.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3897/8460/files/ledipuximuje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2980/6242/files/quantitative_human_physiology_feher_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9559/5938/files/metroid_prime_hunters_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3648/7061/files/rustoleum_tub_and_tile_kit_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8900/1638/files/kipabenoxilamopafigi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7951/5291/files/survival_island_evo_2_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9280/7331/files/super_smash_bros_brawl_sonic_guide_the_great_maze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2005/0855/files/39921836173.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3454/0704/files/ralarex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6976/7831/files/cube_root_of_1000.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8515/2927/files/22160627754.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2286/0956/files/edoptions_academy_login_sis.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_off00005354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5354 5764 bytes
SHA-256: 43320ccfd0dfa415c3a6cb83a6ab9ab346d173d157338a5efdd4f6e46e390fc2
font_01_sfnt_off0000664f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x664F 11096 bytes
SHA-256: efd72fa8201bf1882808e407941332eafaee704d3d7f06075db74a87eac0b0b8

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