Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba960a0728f5573f…

MALICIOUS

PDF

47.8 KB Created: 2020-08-20 07:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c184a4deb18390a8368e658196f6ec1 SHA-1: 728a8bb3a5679ea4625fb5e35ff331d8a4ac9882 SHA-256: ba960a0728f5573f7d0af764e809b665379e7a15b18662de834622088b36d895
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=vmath+teacher+guide'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the redirector URL and a reference to 'vmath teacher guide', suggesting a lure to a malicious site.

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.com/pify?keyword=vmath+teacher+guide
    • http://nekep.thehealthymusicianproject.com/uploads/1/3/2/7/132710621/5c36b45b08aa5d9.pdf
    • http://files.stonerfitness.club/uploads/1/3/1/4/131438079/9429020.pdf
    • http://wolomok.jwsavageinvestigations.com/uploads/1/3/1/3/131398472/buxisalas_fosimuwe_tivigam_dojadado.pdf
    • http://files.drylanddevelop.org/uploads/1/3/1/4/131453623/1306c.pdf
    • http://files.jslegalservices.com/uploads/1/3/0/7/130775286/5f8659d.pdf
    • https://cdn.shopify.com/s/files/1/0432/2328/5920/files/femekozojuxoma.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/31798086116.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/arkansaw_bear_script.pdf
    • https://cdn.shopify.com/s/files/1/0440/2610/1910/files/gimepupepipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/47802698691.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/tasakegovi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/10415372373.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/84561256656.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/35621851892.pdf
    • https://cdn.shopify.com/s/files/1/0433/3305/8710/files/axillary_dissection_technique.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_off00007b40.bin
0ba3bd6c141268baf2d9b9faa50a5ae830d13c1eedd1dd2cebba0432d89acbaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B40 5108 bytes
font_01_sfnt_off00008c71.bin
b53b899dc14c0a0f8edadb2718f8e1683452ce476b59e092563cdb83c7fb2429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C71 11164 bytes

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