Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcef050a08dd090f…

MALICIOUS

PDF

41.0 KB Created: 2020-09-07 17:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 14af85c6dad7769ece4c0c5da22a3a86 SHA-1: b7fc2a4de8539fddd481fe2f7694d8cafc81b93f SHA-256: bcef050a08dd090ff629d3caa8c85ad1062fd1d91513565bf8b93db983ea027c
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a primary link pointing to a known malicious redirector. The document body, though obfuscated, contains text related to 'vpn client windows 10', suggesting a lure to trick users into clicking the malicious URL. The presence of a link farm indicates an attempt to distribute malicious content widely.

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://ttraff.com/wix?keyword=vpn+client+windows+10 In 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/1/0431/9579/3557/files/transport_mechanism_across_cell_membrane.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/0148/8039/files/fakobatasi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6522/1015/files/85246863073.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6283/4853/files/winoxomepezoz.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/253000_7a70b1b8f0f14ae3b4f3f8ee7497d5f7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e3325f_fe6bfc695e89425c857be82a65fbb2ab.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_42f546c2cd7845dba95f46381acebb02.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9cb927_7853b692dc25446a928fac9e592ec03e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/daca0d_8a3973d7e80844ffb317b7b1e25f633e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/575fb0_7d7c27de4e3a437db248ee6abe091cbc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/436160_52cceb93d0e14fd19054a996990fc04d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bfd78a_176f9a02f8d543c29f4c9cbf0861089d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7c41c1_1c0d97fda0cf4c58b81f31f8cf5a9ad7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/97aff7_6aab40d159f5479b95f8bf9fe5b0c8c8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ccb1c6_af3da02434af4ee5be65abec85ee6c80.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b4609a_d298dff2d24b4fc5976f34e9d3c34969.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_6cc8e483236b4629a2d83a1a97a25f86.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fafc38_f7ccb44f6c5a43bf884f20851e308d8a.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_off00006411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6411 5012 bytes
SHA-256: 527f71cc1a5178fcfa15a90814c1b92608beae63db503140f8ce16d4bbab7342
font_01_sfnt_off00007555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7555 10004 bytes
SHA-256: 05a4876961a1ad5b129b512b4850380294529ea9987a82d66c5339ee6076d674

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