Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85c7b27763b2cc4…

MALICIOUS

PDF

44.2 KB Created: 2020-07-23 13:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac4c550f86ce43cc56e01e2a201026b3 SHA-1: 535ae23fa8d70cc31b594817394739dd9dc37257 SHA-256: c85c7b27763b2cc4a8ae8ce96000de5f363af30caa59c7059b4ba127d905eabf
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary lure appears to be a search result for "micropaleontology textbook pdf", directing users to a malicious URL. The file also exhibits characteristics of a link farm, likely for SEO poisoning to drive traffic to malicious sites.

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/wb?keyword=micropaleontology%20textbook%20pdf
    • http://files.patchsprint.com/uploads/1/3/1/3/131379343/8edc7d6f9.pdf
    • http://files.mwpgs.net/uploads/1/3/2/6/132681660/9a7969582dafd7.pdf
    • http://files.capetowndaytours.net/uploads/1/3/0/8/130874629/bugob-bowon-jozopo-vudux.pdf
    • http://files.mairibudreau.com/uploads/1/3/0/7/130776864/ziwawajobigogefivane.pdf
    • http://files.electricianlivingston.org/uploads/1/3/0/7/130775968/jorixoxipejowefapi.pdf
    • http://files.mairibudreau.com/uploads/1/3/0/7/130776864/ziwawajobigogefiva
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/podivo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/32047900474.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/bewosogopewanajadometotis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/11931932776.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/97079043805.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/48268713949.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/ponibu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/47125755779.pdf
    • https://cdn.shopify.com/s/files/1/0437/0972/6888/files/26554584143.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/pujapukapitav.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/91293465164.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3074/files/xogajubalikujo.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_off00007226.bin
cf7c4efc4522a7a74a682104cf8e73375427d3d08cc7dd5c0187380a8e00ba79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7226 5312 bytes
font_01_sfnt_off0000844d.bin
883ffabd53f4d08441fded9d5baf37268d8a943c222d20c67b38c196a92bb616		 pdf-font-stream PDF embedded font (sfnt) at offset 0x844D 9268 bytes

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