Malicious PDF — malware analysis report

Static analysis result for SHA-256 c547cd33388a7120…

MALICIOUS

PDF

36.1 KB Created: 2020-03-21 11:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f1d3043b95925349211910758319c329 SHA-1: ce63cd54a43143a87da199099645fd593b7baf2a SHA-256: c547cd33388a71200a05896fc66b386ed735e6de2826f8cbd76af0c794228a93
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains some of these URLs, reinforcing the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://kreativekidsworld.com/uploads/1/3/0/4/130489933/130489933.html#tal%27dorei+campaign+guide+anyflip
    • http://www.ridesharesarah.com/uploads/1/3/0/5/130550855/7a530b.pdf
    • http://missionarytest.com/uploads/1/3/0/6/130620484/vinotefamodolabuta.pdf
    • http://supportforyouth.com/uploads/1/3/0/3/130379228/3604564.pdf
    • http://www.thelayeredcrepe.com/uploads/1/3/0/5/130541552/sikuvubigufid.pdf
    • http://thecrazycatlady.org/uploads/1/3/0/7/130776567/927e1c2343.pdf
    • http://ucsfophthresidency.org/uploads/1/3/0/7/130776089/gaxuvuvap-nufuparawa-kiguruxo-mujovub.pdf
    • http://seatheswitch.com/uploads/1/3/1/1/131163669/4744f3f.pdf
    • http://schattenmann.org/uploads/1/3/0/8/130873976/7373527.pdf
    • http://minervalodge250.org/uploads/1/3/0/7/130775261/186132757.pdf
    • http://yesonlc1.com/uploads/1/3/0/2/130271148/vejupobogaxiga_lerezuxafeze.pdf
    • http://skinbeautybymaggie.com/uploads/1/3/0/6/130604803/646975.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006384.bin
748c805aac9e2a3ec7ca1af3e41ee664f512df6f558a68fd478d09a8cf524590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6384 8372 bytes

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