Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd4e67969aa65ae…

MALICIOUS

PDF

47.4 KB Created: 2020-08-09 04:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c744b9d930e5b15cc96141b42632807e SHA-1: f9e4125e602b44c5fc7a233d6ffe15a23cecc787 SHA-256: 5fd4e67969aa65ae9f62c7fb323f45db35c19bd93a039edee6dbf924b68b77f0
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 hosted on Shopify, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=exercices+articles+partitifs+pdf', which is flagged as malicious. This suggests the document is designed to redirect users to malicious infrastructure, likely as part of a phishing or scam campaign.

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=exercices+articles+partitifs+pdf
    • http://files.harrisburghigh.org/uploads/1/3/1/3/131379371/d7ff44.pdf
    • http://kifutov.mindraym5.radiologyequipmentstore.com/uploads/1/3/0/8/130814017/754e38.pdf
    • http://files.haleykatharine.com/uploads/1/3/1/4/131407424/surawojamo_nukobuwumova_botimutin_jadipu.pdf
    • http://zezos.trireflextherapy.com/uploads/1/3/0/7/130776485/litakupag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0044/7655/files/93917225049.pdf
    • https://cdn.shopify.com/s/files/1/0428/3210/1543/files/najazobebarikanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/kodutobo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0040/files/administracion_de_recursos_humanos_snell_bohlander_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9208/files/doctor_who_season_10_episode_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2856/files/gorasazipazonu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1299/files/apartment_building_floor_plans_with_dimensions.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6791/files/android_setup_wizard_disable.pdf
    • https://cdn.shopify.com/s/files/1/0446/1009/3219/files/update_advanced_combat_tracker.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8557/files/pdf_password_cracker_linux.pdf
    • https://cdn.shopify.com/s/files/1/0440/9750/3384/files/17298114466.pdf
    • https://cdn.shopify.com/s/files/1/0444/8894/9927/files/spell_check_acrobat_pro.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/jodomaxowevifu.pdf
    • https://cdn.shopify.com/s/files/1/0441/0766/1464/files/python_logging_syslog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/dadotalaxeduwuvekodogi.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_off000077b0.bin
9dd25e65fe4707bad0225bc0af2fe093d07628842d887248143f6422802119c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B0 5172 bytes
font_01_sfnt_off00008965.bin
839b119702b55c5a60bd0072c45da20115cdc2f28fbe13a21f94f8cf470662b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8965 12560 bytes

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