Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7bf430e3ca00f8…

MALICIOUS

PDF

43.6 KB Created: 2020-11-03 17:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fbd1610e0e14a5235567ee3ec3fda9ba SHA-1: 2f8f35bfe3e88731e1de876510206b6023c7916e SHA-256: 9f7bf430e3ca00f8cb5bb8089859e4a67721d2890b85def90831e6a47cc438f8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or phishing campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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://ttraff.me/123?keyword=dr+seuss+accomplishments+and+awards In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f870f1635d67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f8fab044b99d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_5fa146750d879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5f8b2f6e2aca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5f9a40104e118.pdfIn PDF document text
    • https://mexarufuwusa.weebly.com/uploads/1/3/4/5/134599415/bixokidodir-fuwibuxilun-dosepafite-boxupi.pdfIn PDF document text
    • https://nopirirog.weebly.com/uploads/1/3/4/2/134234714/5aa28b614fdfa.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/4948420.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/rajojul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8774e2661c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_5f9fbf6ee4956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5f88ac6632340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAD 5404 bytes
SHA-256: 2095094b3ed5430e5189eb06f3a22b42fb08889ffc3ae9bbd760c53901a60cf0
font_01_sfnt_off00007cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF7 10932 bytes
SHA-256: 3130be8f8b8274b19913c8d0a1dfe416ba9a1efdbbd29e1835bd6f620ee4b9df

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