Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a3dbcaf8ed6db4…

MALICIOUS

PDF

45.2 KB Created: 2020-07-31 12:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ff74a1bfd08b134bd43a88ca5e9d2c3 SHA-1: d5bf77a5171fb4ea5cefa651800c7ba1b4241920 SHA-256: f4a3dbcaf8ed6db4cda60578367993898537b832b920db2fd840fa2ee4a7108e
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 PDFs hosted on various domains, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The primary attack pattern involves luring users through these links, with the ultimate goal likely being credential harvesting or malware delivery.

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.cc/pify?keyword=punctuation+rules+worksheets+pdf
    • http://files.smenard100.com/uploads/1/3/0/7/130739387/440557.pdf
    • http://files.flatspokecycles.com/uploads/1/3/1/4/131408529/6549756.pdf
    • http://files.michaeljamesoberhauser.com/uploads/1/3/1/1/131163705/9294753.pdf
    • https://cdn.shopif
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/daxata.pdf
    • https://cdn.shopify.com/s/files/1/0429/0409/2839/files/gibomiboxawifed.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/kobujelewezezo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/93867959982.pdf
    • https://cdn.shopify.com/s/files/1/0433/4659/1903/files/benofatipazad.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/17041547609.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/36201286476.pdf
    • https://cdn.shopify.com/s/files/1/0432/4392/9757/files/72466341373.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/95480833103.pdf
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/simunavujijumuj.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_off0000728a.bin
a13caad6148dc6142914365510451401dbfa2e3e2f4b99794120c0093bec9964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728A 5284 bytes
font_01_sfnt_off00008481.bin
cc5ffdbd88bb7b86bde4282657e9ad458f199fb9ec9345a5ce2801a96444c9f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8481 10544 bytes

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