Malicious PDF — malware analysis report

Static analysis result for SHA-256 a002cecf8b4fc396…

MALICIOUS

PDF

64.7 KB Created: 2020-11-26 20:15:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e739c15838b2eeadbc85cca59038f2d SHA-1: 1ee15ba55cf42f3517384e9190bd80da82ae1419 SHA-256: a002cecf8b4fc3968ff7b036bb75ace2d4d09dd325d99b3bcd14a260c2dd3387
154 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 'https://cctraff.ru/strik?utm_term=nucleus+7+sound+processor+cost'. This indicates the document's primary purpose is to redirect users to a malicious site, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=nucleus+7+sound+processor+cost
    • https://cdn-cms.f-static.net/uploads/4369519/normal_5f8a8a6f9b9b7.pdf
    • https://cdn-cms.f-static.net/uploads/4480895/normal_5fadc518be5f8.pdf
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f91a330a0a04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vutame/lord_of_the_flies_chapter_4_questions_and_answers.pdf
    • https://s3.amazonaws.com/wurivuve/vojakojoken.pdf
    • https://s3.amazonaws.com/vavale/brown_dragon_dd.pdf
    • https://s3.amazonaws.com/leguvefu/legogawizubamomepufokife.pdf
    • https://s3.amazonaws.com/lovetijif/25435609746.pdf
    • https://s3.amazonaws.com/henghuili-files/kovigejira.pdf
    • https://s3.amazonaws.com/rubidokezive/hec_lat_answer_key_2019_july.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_off0000c038.bin
2a1994586774bddc9f6ec1ca6129410df0f41766c0c10fcb908a88831d286452		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC038 4904 bytes
font_01_sfnt_off0000d106.bin
69f3e865293a83ad2cea78cf3ccde083e275b7f02ec388c7884bcebd775b17b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 11072 bytes

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