Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac7a814525f8d51…

MALICIOUS

PDF

66.3 KB Created: 2020-11-30 18:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9a74de2dd7d09203332ca79804d6c909 SHA-1: ece85f87d75c76e4d2a2ecb033289754bb869dff SHA-256: cac7a814525f8d514450725f54131933d1d518f9e025fc6ebddc867db13994b9
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/aws?utm_term=aimersoft+blu-+ray+ripper'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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?utm_term=aimersoft+blu-+ray+ripper In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_5f8ce2cd1bc62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f99093fbcf4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5fb6cfc566648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_5fbb114d8b8af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_5fb2be9921fde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5fad8d1870765.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/tabobujimo/17817306610.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/how_to_make_a_witches_broom_out_of_tulle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ebc521-802c-4061-8fd3-c799c4b39213/vafivudewonitot.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/klasifikasi_acetobacter_xylinum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3acf82-26fd-479b-9f24-464088f95706/36163670464.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea1fa8793968640865e0/t/5fc111a84f98375720057bb7/1606488489856/pubedawalunupekuvukepava.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/cours_d_anatomie_de_l_abdomen.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4a459d79364840843980/1606371909454/four_texts_on_socrates.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_off0000c708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC708 5312 bytes
SHA-256: 495b9c7671f2dab8fadbc7056b1a360257a0f2c3c6ef6e5599e3825adbdbbf49
font_01_sfnt_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 10452 bytes
SHA-256: 103f1d1749b7e89b6af6d22054e936ba2111e67ccef9229a504aadf32c1d44f6

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