Malicious PDF — malware analysis report

Static analysis result for SHA-256 4173a4b2582ca2df…

MALICIOUS

PDF

42.1 KB Created: 2020-11-05 13:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8d3cc0f0b153b50c3655130f84f6f1cf SHA-1: 188b0187b7767a45024aaa94cc6618c9329d857c SHA-256: 4173a4b2582ca2df0193cf8d5bee59412684811e978faf5176c80167b5648b54
94 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a link to known malicious redirector infrastructure. The embedded URL, https://cctraff.ru/strik?keyword=a+chip+of+glass+ruby+summary, is likely the primary mechanism for delivering a subsequent payload or directing the user to a malicious website. No scripts were extracted, but the presence of a malicious link in a PDF is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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/strik?keyword=a+chip+of+glass+ruby+summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f9217078cfce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5f8921db3c38d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_5f978a8716cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_5f92cd904f274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5f8d514a20646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd8429e-1579-4f84-a111-3b96ecc9e389/98043259193.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/30942399545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b59b1098-26b9-4a19-87a9-d98f86330978/chapter_8_covalent_bonding_worksheet_answer_key_pearson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa330b6-dcd5-45da-9d8c-37f2a91e10e5/reset_manual_ip2770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea1ee4d-e3c7-4538-9405-ab83f4876d46/aziz_ansari_snl_monologue_transcription.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/70240277366.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_off00006533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6533 5660 bytes
SHA-256: dad80ec38230e98de727f0161d6bfcbed4237fb9689d0e1b3ee6d6b741ec0f65
font_01_sfnt_off00007858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7858 10328 bytes
SHA-256: 737e6f7a31597737a7e89061e29318335595637943eb1f3f1af44d4a8171ae58