Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82ea2a273ef258d…

MALICIOUS

PDF

50.7 KB Created: 2020-10-29 11:37:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c4a2c035597a17489d1f8a7120de33d SHA-1: 763cd151559ecf55932822c4979b05bd7f7b488f SHA-256: e82ea2a273ef258d0fe43a737155758413b72eb5f91fbf4b56175ed21c4ee0ee
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://cctraff.ru/aws?keyword=terraria+calamity+ankh+charm'. This suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/aws?keyword=terraria+calamity+ankh+charm
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5f8818145eb41.pdf
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f885d4d6577c.pdf
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f8b9955d4cdc.pdf
    • https://cdn-cms.f-static.net/uploads/4409806/normal_5f99c1cdcca15.pdf
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f90c93df40b7.pdf
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5f93a28fdd7bc.pdf
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5f9712bd4ba5b.pdf
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f9824411c3de.pdf
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f99b1d86765a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/jibimelisukuf.pdf
    • https://s3.amazonaws.com/henghuili-files2/basic_english_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0498/9416/2621/files/skeletal_system_worksheet_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0507/1405/0720/files/vifamotagojumanivifevako.pdf
    • https://s3.amazonaws.com/mutirexa/tracy_chapman_songs_youtube.pdf
    • https://s3.amazonaws.com/najubu/cell_membrane_images_worksheet_answers_biology_corner.pdf
    • https://cdn.shopify.com/s/files/1/0480/9752/5912/files/celebrate_recovery_lesson_22.pdf
    • https://cdn.shopify.com/s/files/1/0268/6998/9559/files/pirik.pdf
    • https://s3.amazonaws.com/viromibukoleliw/limbic_encephalitis_treatment.pdf
    • https://uploads.strikinglycdn.com/files/2f4369af-9174-495f-aac5-d79079116304/tres_metros_sobre_el_cielo_cast.pdf
    • https://uploads.strikinglycdn.com/files/5ea9b01e-029f-4f3b-aa33-4ad767536522/auslogic_boostspeed_review.pdf
    • https://uploads.strikinglycdn.com/files/7d4046c1-8536-4295-8c7e-db313c7a1cd4/48371355405.pdf
    • https://uploads.strikinglycdn.com/files/30ba3683-5a0f-4f1c-9fdd-5d902b37f5ef/28384100548.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/normas_apa_para_citar_bibliografia.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_off00007ef3.bin
7406d1245fd982946d731d20597c4701bbecdd325f2d935bfc95bf12b01d3698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF3 4976 bytes
font_01_sfnt_off00008fbc.bin
0c87c7ce8b1f7b331197c9bade7f5fb079a34379b1060d50ff8a69073377a4c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBC 14508 bytes

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