Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03b12dfaa18ac4a…

MALICIOUS

PDF

46.8 KB Created: 2020-08-03 11:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b01e05696540056303590da64a54614a SHA-1: c8491e1baf153d8a385703452188ac900f73b03f SHA-256: f03b12dfaa18ac4ac23d23cdfb26bddb7cbe39a118518039d6ce68aa5d979b21
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://ttraff.ru/pify?keyword=cedar+bluff+fishing+report, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'cedar bluff fishing report' and the authoring application 'wkhtmltopdf', indicating a lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=cedar+bluff+fishing+report
    • http://files.vonderhauswulfgermanshepherd.com/uploads/1/3/0/8/130813797/fivepeno.pdf
    • http://files.livolivo.com/uploads/1/3/0/7/130775228/1466683.pdf
    • http://files.saintpatrickwapella.org/uploads/1/3/0/7/130739949/558173.pdf
    • https://cdn.shopify.com/s/files/1/0432/1119/4525/files/vijuxom.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4476/files/divogosogozozibu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8015/4269/files/taxudawipefagekire.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/11686413758.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/97967694095.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/90421899562.pdf
    • https://cdn.shopify.com/s/files/1/0440/1332/2398/files/1990715480.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/dovonavimuzazakasipifij.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/85752681355.pdf
    • https://cdn.shopify.com/s/files/1/0431/9952/9120/files/zekebunopiruzidolivula.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/kokufalerilapizafurepekib.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a58.bin
1b45985a2ac721d54aca5301a9e7a5a0827bd79a164147fb877403bdab7e0ced		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A58 5348 bytes
font_01_sfnt_off00008c75.bin
e66c0ddb176db2148130a4866444a244cee54ad6edda1adeb97502f992a1381c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C75 10044 bytes

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