Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ea6b6036549515…

MALICIOUS

PDF

69.1 KB Created: 2020-10-27 05:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0cb83105d0e0fd9fe656fa1788398e9a SHA-1: b1b3930e4f3f856b3c6d960016c4b6efede43fab SHA-256: a1ea6b603654951534312896896da98d5d896139560886fa9e54adc31eca2383
154 Risk Score

Malware Insights

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

This PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One prominent URL, 'https://cctraff.ru/strik?keyword=unblocked+vex+3+hacked', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this malicious URL, indicating an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?keyword=unblocked+vex+3+hacked In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_5f95cfe6d3300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_5f953b9b025fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5f92160a81ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_5f9230c88a52f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f87abb6b429e.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/redirutaloxiviwirage.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/lekutiwozaworelil.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/zakikasixavu.pdfIn PDF document text
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/8823033.pdfIn PDF document text
    • https://degujipimisa.weebly.com/uploads/1/3/1/4/131453395/cd00fdab6c.pdfIn PDF document text
    • https://jiwadurator.weebly.com/uploads/1/3/0/7/130776405/gomilimitara.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5140/0391/files/music_scales_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0940/1254/files/kufexeli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/18881704745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4294/6715/files/automation_direct_hmi_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7244/4328/files/new_indivisible_guide_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d56cf8e-3683-41b2-9e04-e08ed12fa6c0/zone_diet_meal_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b426025-1943-42cb-9fde-886baf326af9/pavithram_songs_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c564cf80-35ad-43f8-af33-5b75eea51799/34618701253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8e27b8-449f-4a42-87a4-8da06f5ac192/alicia_who_sees_mice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f57a5927-25d0-428e-b8cf-b7b91a4e4c6b/rinebaxafirikevonunovuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1836/0250/files/all_programming_languages_and_their_uses.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8509/3792/files/iatf_16949_copy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8509/3792/files/internal_storage_path_in_android_studio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9716/8282/files/beretta_92fs_inox_stainless_steel_guide_rod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1475/3951/files/fire_service_training_manual_volume_4.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ceee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCEEE 30636 bytes
SHA-256: a4a84257144d277cd4f3074a7451b9f41dd736f11ac044624474bfc78992269a
font_00_sfnt_off00009501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9501 5240 bytes
SHA-256: 38fc91a3258b749fc6ba88b19fee371767ae7c65389054822654b390207fac5d
font_01_sfnt_off0000a6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D5 12156 bytes
SHA-256: 0cfeff87c2a86d216815be95e0df385faa129869d16e99c14ab5ca9feeb81fa4

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