Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee6d40083f1629f…

MALICIOUS

PDF

28.6 KB Created: 2020-06-09 00:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d29863b78ffa4a4f1667eecc612898bb SHA-1: 7772c16c180e4d7da9592fb580fbbfcbb512c6ef SHA-256: 4ee6d40083f1629f2a9726f9b81d64f2202f6269d748f5f888a100def0e9f13c
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 document body also contains these links, suggesting a deliberate attempt to create a link farm. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link distribution. No scripts were extracted, and the primary attack vector appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://hostmaster.winefest.ca/uploads/1/3/0/5/130551399/130551399.html#schwinn+470+elliptical+machine+owner%2527s+manual
    • http://kopeksecurityltd.com/uploads/1/3/1/4/131453706/4c990bc8c.pdf
    • http://natestreeservice.net/uploads/1/3/1/8/131856554/vimogurekuwodinegon.pdf
    • http://e4kh0.bpmtc.com/uploads/1/3/1/3/131397997/kukuwozedod-diduwakixuluxe.pdf
    • http://x-trakop.se/uploads/1/3/0/6/130604105/cf5411.pdf
    • http://ideasflowershop.com/uploads/1/3/0/2/130288316/tudiwaguw.pdf
    • http://antiagingwisdom.com/uploads/1/3/0/7/130775652/kifeziwowiluripe.pdf
    • http://akktinstantautomation.com/uploads/1/3/0/5/130551116/6350234.pdf
    • https://lutimez.files.wordpress.com/2020/06/nezapiginozetixeb.pdf
    • https://gupasuva.files.wordpress.com/2020/06/poralulawejepe.pdf
    • https://vexopebugu.files.wordpress.com/2020/06/magofalorodimijo.pdf
    • https://tekunotu.files.wordpress.com/2020/06/faragukaladiner.pdf
    • https://zivuwisi.files.wordpress.com/2020/06/nelewojirogamapowinat.pdf
    • https://jakazikosab.files.wordpress.com/2020/06/vokefapa.pdf
    • https://digawuxedado.files.wordpress.com/2020/06/gedalosipewol.pdf
    • https://kemalorudor.files.wordpress.com/2020/06/pevinitadi.pdf
    • https://megazotawulo183772260.files.wordpress.com/2020/06/635014480.pdf
    • https://wawedugud747515798.files.wordpress.com/2020/06/dizoku.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_off00004a4c.bin
080f0f7c30db4a4e82ba0d93d6277337354db11154bd6673437b3a6e83da0e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A4C 8344 bytes

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