Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce50d381a3e6dd5e…

MALICIOUS

PDF

42.3 KB Created: 2020-10-30 15:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0c9ac8abebf211023e82b969206b5215 SHA-1: c4c7128a73ca55ace9af8a068d4b817b9ad3d7f5 SHA-256: ce50d381a3e6dd5ece6d3f718e0a5d4fb54b037899270bdbf9293cac067afe8e
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that point to a known malicious redirector, disguised as an invoice notification. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of the URL 'https://gettraff.ru/aws?keyword=all+invoices+have+been+sent' strongly indicate a phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gettraff.ru/aws?keyword=all+invoices+have+been+sent In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408463/normal_5f966756147a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387811/normal_5f96f00048a96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f94aa545b80c.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/gobok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f87bca0e8507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_5f912753bea90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_5f913aba6abc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f8f295028cbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407989/normal_5f96d669dcc42.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/tibitexil/takimiwosipoze.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/second_conditional_reading_comprehension.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/autocad_2013_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/linda_colley_britons_forging_the_nation.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/48465570505.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_off000068ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68AC 4980 bytes
SHA-256: 28e6dfc4c849fedf9872dbeb132d36c176cb92357cc64fe997f6d40b5b2b560e
font_01_sfnt_off000079a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A3 10236 bytes
SHA-256: 9643f3d3e3123abd65c59c73980ec90ebdf9320d59465a6dc8c1b5eac6128aaa

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