Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd2df38625d83eb…

MALICIOUS

PDF

36.0 KB Created: 2020-04-10 03:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 9f53130e4df55b48f644ea730a1635c0 SHA-1: aede24353d72917b29c187814465e70ef4e59e7d SHA-256: 3cd2df38625d83eb5804da5d6924bac2929a4f2de2ef724101d5f58db74e662a
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and a large number of external links, many of which point to other PDF files hosted on similar domains. This behavior is indicative of a link farm or SEO spam campaign designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://misssupremepurityqueen.com/uploads/1/3/0/4/130435966/130435966.html#tails+of+equestria+pdf+download+free PDF link annotation
    • http://masstrappers.net/uploads/1/3/0/5/130547486/74476.pdfIn PDF document text
    • http://ccmclb.com/uploads/1/3/1/3/131398187/pebekesuvexuxira.pdfIn PDF document text
    • http://edsanseverinophotography.com/uploads/1/3/0/4/130435783/2043376.pdfIn PDF document text
    • http://paprepservices.com/uploads/1/3/0/5/130543092/bixakenodewopam.pdfIn PDF document text
    • http://orderedelements.org/uploads/1/3/0/5/130544136/xuvetaxozonoduxifor.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6147 8732 bytes
SHA-256: e9bdb542cac8b5b82d889110c21b6118f82336911456df5d8e41202862750ca5

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