Malicious PDF — malware analysis report

Static analysis result for SHA-256 3265a37c3bf1daf3…

MALICIOUS

PDF

42.6 KB Created: 2020-08-19 01:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a19bfc6b809ceda8ff4a4b7c7cad77a0 SHA-1: 887d91a883aea60c704e55167352881c09a2b428 SHA-256: 3265a37c3bf1daf3a1bb386b59cf378652393e4bf042343ecf2c9815d4e4e224
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a study guide. The document body is heavily obfuscated but contains the malicious URL. The presence of numerous other links to Shopify-hosted PDFs suggests a link farm or SEO poisoning attempt to increase visibility. No scripts were extracted, limiting the analysis of the payload delivery mechanism.

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.com/pify?keyword=guidon+army+study+guide
    • http://files.shustercomedy.com/uploads/1/3/1/8/131857315/favulefopazoxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2987/9194/files/47874155126.pdf
    • https://cdn.shopify.com/s/files/1/0437/2581/5959/files/libro_el_magisterio_de_la_iglesia.pdf
    • https://cdn.shopify.com/s/files/1/0430/8172/8151/files/analyzing_financial_statements_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/blessed_names_and_attributes_of_allah.pdf
    • https://cdn.shopify.com/s/files/1/0430/3696/7063/files/70943041895.pdf
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/60979586845.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/pexage.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/nebifanadinejomanito.pdf
    • https://cdn.shopify.com/s/files/1/0436/5575/7977/files/modern_big_data_processing_with_hadoop.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/86470151743.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_off00006a0b.bin
40758edc1b1f6167c99f4cadf0534fe1b3d238e2de8d346afcd705de06711c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0B 5244 bytes
font_01_sfnt_off00007bd4.bin
09b2a9e88f5eccef68f130b96db1f820d0889a5285efd3485f61220d77c9d879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD4 10076 bytes

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