Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4333870bf75bdf4…

MALICIOUS

PDF

72.5 KB Created: 2020-12-30 09:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3c1abb9f42ec8b573134bbaa23bce4e8 SHA-1: 7fc0756aa7fdec52afe51991461c43295b8f8949 SHA-256: c4333870bf75bdf439ffe86c26e01fa684153fe0c0216a7ba3d5e4f656a86346
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'bbq chicken near me' and application metadata, suggesting a lure. The presence of numerous external PDF links also indicates a link farm, likely for SEO poisoning or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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?utm_term=bbq+chicken+near+me In PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/ef5e6.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/iijgjiy/dark_sword_2_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/jbQuUWy/fusoram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5fd9c273891fa.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/akjcwvi/capitalist_monopoly_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/jbia0hf/favufokuzawejolebusu.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/5bf926853d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/safago/mavefiv.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/astro_file_manager_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/16729135385.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/free_music_apple_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/ingredion_annual_report.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 5208 bytes
SHA-256: be259eb51a2237f7dc41f7e5fdb9b6df84e99622756de67c69f9753418b3c256
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 10856 bytes
SHA-256: 7a2d3c7816002bed707b4b301a26a5ac12bc82c933b035c423bf9f660a8773f8

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