Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b86b11286524a3…

MALICIOUS

PDF

67.1 KB Created: 2020-08-07 19:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40e23ea79606b56484cec94aad012174 SHA-1: 73742bb13d9ac829a7d5d4c154a8c142eb3b2b70 SHA-256: 78b86b11286524a36b1994ea009a91835c4de8492892e55ac39a73641ea93338
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised with keywords related to Ethereum. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence point towards malicious intent, likely to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ttraff.cc/wb?keyword=ethereum%20blockchains%20digital%20assets%20smart%20contracts%20pdf
    • http://gilog.cindyalewis.com/uploads/1/3/0/8/130814017/702a46212.pdf
    • http://files.shastasjourney.com/uploads/1/3/0/7/130775959/6108419.pdf
    • http://files.trefoilintegrity.org/uploads/1/3/2/3/132302718/5837982.pdf
    • http://files.cefdauphin.com/uploads/1/3/1/8/131857626/zudinajavo_redisowufun_rilalos_fuzara.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2599/7722/files/double_buffering_java.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/94861537165.pdf
    • https://cdn.shopify.com/s/files/1/0433/1261/1481/files/cmd_commands_for_windows_7_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4416/6037/files/excel_2020_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/gakurewukifuru.pdf
    • https://cdn.shopify.com/s/files/1/0437/8145/6023/files/beetroot_soup_recipe_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/zevuvosatoja.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/tupegobimaguvef.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1700/files/46586051687.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/75742188177.pdf
    • https://cdn.shopify.com/s/files/1/0440/4038/8758/files/dobitimeligibujo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5612/8412/files/22282687841.pdf
    • https://cdn.shopify.com/s/files/1/0428/6382/0959/files/32835757313.pdf
    • https://cdn.shopify.com/s/files/1/0447/3644/6613/files/manuel_s_vintage_room_menu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c63d.bin
782ede02143368edac252da81eeb22d89e007910562ccd37d858abdb8c0bb143		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC63D 5728 bytes
font_01_sfnt_off0000d993.bin
cbbca86a28eaf62c55238561b4acc3bb8b8e43790866344e66fc35d87f13ade8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 10880 bytes

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