Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb929f4739d8ce14…

MALICIOUS

PDF

69.0 KB Created: 2020-11-11 07:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a1917cc8be1ecc59c1c4b15bfd8fc3cd SHA-1: 959d2c278249bf6d827e4f34fca9b7a1867e58c9 SHA-256: bb929f4739d8ce14a55db39d13c6ab956d61bc5e721e2f42f31e391d1490a48a
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that, when clicked, leads to a URL associated with downloading potentially unwanted software. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded malicious link suggest an attempt to trick users into downloading a payload, likely related to the 'Viva video mod apk download' lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?keyword=viva+video+mod+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f952d6b0a0e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f87303d1fa3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464530/normal_5fa4b81d7d409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_5f9c6d72bae83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_5f9d3b0e3de9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f8f89fd03f93.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/muvunekagok/silence_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/70834076279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc311d4-b150-449b-9430-02235a83e50a/fevotenizamapopafod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd1319ec-736a-4521-945d-c0b80797f6d2/kodak_preps_7_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186ff1a5-ef10-4c9d-9d89-1f4fe9b0f133/4352457541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4cbf03-16e2-4371-b56f-67f7d9da7487/34108646046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a20cbd-e0ec-4a8d-8a07-bb64a0662651/remapomogabikefilit.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/scout_handbook_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef57f0a5-19e0-42b4-aea8-7edf835aa281/61472330193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f15c2b-66a4-4ed7-8104-fd2b9df6a305/75627759233.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_off0000d1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 5012 bytes
SHA-256: b73b4cb3a14cbdf5eb836833031c6766b565fb85f015c2e0faac9d1fa6f3a971
font_01_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 10656 bytes
SHA-256: bd173495575ed29cda27189712a5e4224c44269b1fda373ff03df49ad36e9d44

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