Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc7a5412b24d38e…

MALICIOUS

PDF

38.0 KB Created: 2020-11-08 10:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7578fa4848bf4c1f4d50a4a450245096 SHA-1: 23a38ab753d78311013240c7d8d207f495098c35 SHA-256: 9bc7a5412b24d38e8319eb82292a5ba75090431c1f1c5995cc25ec186cf85362
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains a heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector finding. The presence of numerous external links, including one to a known malicious domain, suggests an attempt to redirect users to potentially harmful content.

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://gettraff.ru/123?keyword=mitchell+high+school+nc+website In PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/2525796.pdfIn PDF document text
    • https://pinukavuzufov.weebly.com/uploads/1/3/4/3/134307945/wuzegir.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/kabisebax/93855640946.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/zuwojolugipi.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/kaze_to_ki_no_uta_english.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/lurijuvikas.pdfIn PDF document text
    • https://wimosera.files.wordpress.com/2020/11/miluvi.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/color_by_numbers_free.pdfIn PDF document text
    • https://kizajatisa.files.wordpress.com/2020/11/73733243449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ded189-ddd1-4e43-ae5e-afac8aa909a6/neurological_differential_diagnosis.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/losofodatumag.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_off00005454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5454 4992 bytes
SHA-256: 7561ce8ced9a49b0f5898f07dc8f2b35cb6314289d594458d26b291d294f0f77
font_01_sfnt_off00006576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6576 10956 bytes
SHA-256: 6c2a90d38170695fb1895311aa4506f151afb74311f2326c1b84d45df77d413c