Malicious PDF — malware analysis report

Static analysis result for SHA-256 6462426ba893533d…

MALICIOUS

PDF

40.8 KB Created: 2020-08-15 05:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fea2561eccfd655c922c13efc656a66 SHA-1: fb1c1476f0dbb27822fe2f548dfbb29b23f805c5 SHA-256: 6462426ba893533d23552c3768bdc40bc8f3ae762ba3259b563168e08824010d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a link farm designed to appear as educational resources. One of these links, https://ttraff.cc/wb?keyword=infinitives%20worksheet%20with%20answers%20pdf, is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the PDF structure suggests an attempt to lure users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=infinitives%20worksheet%20with%20answers%20pdf
    • http://files.spaceliftinteriordesign.com/uploads/1/3/1/4/131409755/1776386.pdf
    • http://files.centerforartandhealing.com/uploads/1/3/1/3/131379382/313933.pdf
    • http://files.titaniumflower.com/uploads/1/3/0/8/130814308/8365443.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6630/8246/files/ars_paulina.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5480/files/vaxoretejewabefavuku.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/70230741645.pdf
    • https://cdn.shopify.com/s/files/1/0440/5710/0453/files/fifulol.pdf
    • https://cdn.shopify.com/s/files/1/0434/1638/7733/files/xatumunap.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/dovalisodugerinebopo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3302/4929/files/advanced_wastewater_treatment_technologies.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/niratogo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0594/9590/files/37897608228.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/bearing_design_data_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/tuwexubofoboj.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8375/files/monumumoza.pdf
    • https://cdn.shopify.com/s/files/1/0428/2512/1959/files/bleep_sound_effect_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7760/7324/files/sejojisaded.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006004.bin
50136598dc636455d777b800e2573d102d9c1b91fefccfadf81123376ed9ff6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6004 5252 bytes
font_01_sfnt_off000071f0.bin
c5db28390fea740178545e0e74921c7e4836b8660c061f7c3accf069df76e9de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F0 10656 bytes

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