Malicious PDF — malware analysis report

Static analysis result for SHA-256 240bcfec4377a22d…

MALICIOUS

PDF

46.4 KB Created: 2020-10-30 00:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6b9251eaeefa36c68ae6c89c88f9b25 SHA-1: 161a86e3bc9b7ec179da21bda1f623b7f9f9988a SHA-256: 240bcfec4377a22dca4e7b4e37c985e5b61e2a37eeee6e6ee11d1b85d61a8cd4
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content. The document body contains obfuscated text and a URL that likely serves as the initial stage of a download or redirection chain.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?keyword=battle+ground+school
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5f974ef2ee970.pdf
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f96d22d747b7.pdf
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f8ddbf21d6a3.pdf
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f87cb81545f4.pdf
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8766667b6e0.pdf
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5f9b3cfa8c59a.pdf
    • https://cdn-cms.f-static.net/uploads/4384822/normal_5f9b3cf68bdef.pdf
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5f8d6387b6082.pdf
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f8a0bbd2ad2d.pdf
    • https://cdn-cms.f-static.net/uploads/4393190/normal_5f8f1968ee874.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d1ef5314-96c8-455e-a770-6d284d460243/kulapelozatifo.pdf
    • https://cdn.shopify.com/s/files/1/0483/4600/5664/files/27798357998.pdf
    • https://cdn.shopify.com/s/files/1/0503/2994/4222/files/classification_of_joints_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0486/5589/2630/files/tewefulokogosojozut.pdf
    • https://uploads.strikinglycdn.com/files/3e047c09-d06e-4f6b-93cc-b84fbb4c0f2c/kazigigatamuja.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006855.bin
4b6afe204133633b62346ea9aa1d3051d41e2f016e96066fee6fbfd0839761fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6855 5084 bytes
font_01_sfnt_off0000798f.bin
4e57767d6e35de0c5f1403582572c4110320fb852a267be48e062101dfdb31a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x798F 10844 bytes
font_02_sfnt_off00009e67.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E67 4324 bytes

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