Malicious PDF — malware analysis report

Static analysis result for SHA-256 d015c0706a35c734…

MALICIOUS

PDF

76.2 KB Created: 2021-01-14 03:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cf71fa14723a1f8f93df3a46a108d1c3 SHA-1: 72d61fd8b5aa233d862daeb13f0ce4fd5a7ca9b1 SHA-256: d015c0706a35c73461d30b931449bfd8c938acca4964382b1707b05e45899f0b
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates a malicious intent to redirect users to a harmful site. The document body, though heavily obfuscated, contains text related to 'teacher appraisal reports', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/123?utm_term=sample+format+for+teacher+appraisal+reports In PDF document text
    • https://cdn.sqhk.co/mugapowejog/cwhfTvg/zombie_strike_codes_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411683/normal_5fa73a260155c.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/jcjjt0h/special_forces_group_2_mod_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/gi6igcP/81399420676.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/HibN8mL/lajawagoxumolaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hjjaVie/hidden_objects_worksheets_kindergarten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_5f9f2f275402d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413703/normal_5fed31a9804d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481059/normal_5fb4ceb277c8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_5fdb79cf47023.pdfIn PDF document text
    • https://cdn.sqhk.co/dagedazi/zHhgTja/word_mind_cross_game_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5f9b1b7856a24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446762/normal_5fa1c135b109f.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/xafaxotaful/lijokagapedudexotapo.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/32792986946.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_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 5356 bytes
SHA-256: 1ac5feae36096acd8b11a518bac4766de7209062e26e23f4d86466e5f40d3b5d
font_01_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 10428 bytes
SHA-256: 7448bdf53a8e5f05a823844751e8ae78f2d778364705670141fa855b9fdbeb5e

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