Malicious PDF — malware analysis report

Static analysis result for SHA-256 62fcf608eafb3f8f…

MALICIOUS

PDF

54.4 KB Created: 2020-04-11 00:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f1517fea99a3cdeea1442376a8aeeaed SHA-1: 73ac3cbaac8ba1239a66af8eedaf2ca6c59903cf SHA-256: 62fcf608eafb3f8f46513c720936e6709a119845a0e0a44cc9bd31af260a5f36
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs supports this assessment. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it is designed to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cyclebavaria.com/uploads/1/3/0/5/130543074/130543074.html#wizard101+halston%27+s+stormy+slippers
    • http://hopedotcom.net/uploads/1/3/0/8/130813768/5532003.pdf
    • http://randyperdueenterprisesllc.com/uploads/1/3/0/5/130541443/9b0d631a4.pdf
    • http://verdantlorrainedev.com/uploads/1/3/1/3/131384656/bumiral.pdf
    • http://jamedicalconsulting.com/uploads/1/3/0/2/130272640/velusaralonera-nelafaz-pojatevetip.pdf
    • http://cindycroot.com/uploads/1/3/1/3/131384721/24f1b2b5d3a.pdf
    • http://coordinatedchaos.org/uploads/1/3/1/6/131606135/1e3d9dcb34.pdf
    • http://jamesbaylee.com/uploads/1/3/1/3/131398097/sidurapajerigapev.pdf
    • http://edmontoncompressionstocking.com/uploads/1/3/0/5/130588621/sevizuwixesipi.pdf
    • http://radite.com/uploads/1/3/0/6/130621942/tenuzisawuva-napuxo-solusu-tibugadelapi.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_off0000adfc.bin
b407cd1dcfc91275699118c7c541029b6a2ff294bab23a9cd5e0b3e79f8b22bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADFC 8264 bytes

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