Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50186518bb1e10b…

MALICIOUS

PDF

36.6 KB Created: 2020-11-04 14:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fc56f88a38781010872ecd432672edff SHA-1: 79173b0bf82e9c9f2fe8dcf7c5d62785eae8a69e SHA-256: a50186518bb1e10b6761ef17a65fb28c5366bb87b677d1c27e87d38d888bfbf5
124 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one identified as a redirector to known malicious infrastructure. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the presence of multiple links and the redirector suggest a phishing or malicious content delivery attempt, likely initiated via spearphishing attachment.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=vocab+unit+14+level+e+answers In PDF document text
    • https://xijuxesipokufi.weebly.com/uploads/1/3/4/0/134042605/zalajumazu-waruvupa.pdfIn PDF document text
    • https://livekurot.weebly.com/uploads/1/3/4/4/134443702/kimovedinofa-zosezex.pdfIn PDF document text
    • https://xagixuruzetel.weebly.com/uploads/1/3/4/3/134319769/9651537.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/9416564.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/5562614.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/3225300.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/2681029.pdfIn PDF document text
    • https://xekozetona.weebly.com/uploads/1/3/4/5/134508060/jajowejilad-kedurop.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/vuforewebub/16675273475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c4a71f-94df-4481-8144-cc249d665ffa/kimopunuzoporaruwemef.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_off0000531d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x531D 5192 bytes
SHA-256: 778320c3b279ed03000279308d0b98860bbe3820c50850046d2b002bb19908fc
font_01_sfnt_off000064f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F4 9776 bytes
SHA-256: 741d66d8893aa9fa61399cbaadcc13c2f2cc80bede05efdc3786236d89fe8651

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