Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e40c3260b34c1f3…

MALICIOUS

PDF

45.8 KB Created: 2020-08-14 23:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f20e7a2420e2a81fc0a9e6f5b370ba89 SHA-1: 4a165abb9bdee2922f481568a5c539a89271143e SHA-256: 3e40c3260b34c1f3c9bb5b6ef041d0073365a32397c21482a80466e58c18b76f
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. One of these URLs, 'https://ttraff.ru/pify?keyword=dichiarazione+sostitutiva+di+atto+notorio+eredi+pdf', is flagged as a known malicious redirector. The document's content, though heavily obfuscated, appears to be a lure related to legal declarations, likely intended to trick users into clicking the malicious links. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=dichiarazione+sostitutiva+di+atto+notorio+eredi+pdf
    • http://files.mylittlebiblestudy.com/uploads/1/3/1/8/131856398/jinarotutivaxazemem.pdf
    • http://mafalazel.gchschautauqua.com/uploads/1/3/1/3/131379732/969363.pdf
    • http://files.kelseygallant.com/uploads/1/3/1/3/131383823/9874079.pdf
    • http://wudab.exploringoverload.com/uploads/1/3/1/4/131453109/b13a7.pdf
    • http://vigoro.sadiereynoldsceramicdesigns.com/uploads/1/3/2/6/132681218/6139571.pdf
    • https://cdn.shopify.com/s/files/1/0447/6397/1733/files/22829748238.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/carbohydrate_metabolism_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nitupalakisotubawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4160/3239/files/aptitude_test_questions_and_answers_with_solutions_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/kerovigokunimuxofoge.pdf
    • https://cdn.shopify.com/s/files/1/0435/1285/6731/files/not_equal_sql.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/8699354320.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/fafinabatusaxokawajepu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7185/files/28216391304.pdf
    • https://cdn.shopify.com/s/files/1/0434/0957/1990/files/taresarolezemaxurikipe.pdf
    • https://cdn.shopify.com/s/files/1/0436/2131/8818/files/lagonifemurol.pdf
    • https://cdn.shopify.com/s/files/1/0429/2440/8988/files/8049663279.pdf
    • https://cdn.shopify.com/s/files/1/0450/1137/0148/files/dekenik.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_off000071d9.bin
22286ee2d0e5f4e597aeeb009498e59109aa19cea7cf039385fcf592167d9111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D9 5320 bytes
font_01_sfnt_off000083ff.bin
31f6fbc5a0df044f7e9de532d3a719162c60d704b2a93c14c2afbee5bc4163fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FF 11076 bytes

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