Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4f35f9df87463f…

MALICIOUS

PDF

40.1 KB Created: 2020-04-10 00:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 182d96b9fc2204ab11a4205068afcf4b SHA-1: 9e43b5fcdd906b24ffc23d57749419fcac9a4b86 SHA-256: 2b4f35f9df87463fb713f1795ccc5110104a1e8c42937c63667eac04cc784e5d
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to external PDF files, suggesting a link farm or redirection tactic. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links. The document body contains the title 'A million dreams pink' and metadata indicating it was generated by wkhtmltopdf, which is often used to create SEO-optimized content, further supporting the link farm hypothesis.

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://cecilyeiferle.com/uploads/1/3/0/2/130289686/130289686.html#a+million+dreams+pink
    • http://alcyouthsports.com/uploads/1/3/0/4/130483260/xazoduvedatudim.pdf
    • http://readcoolbeans.com/uploads/1/3/0/2/130289242/20668175bd846.pdf
    • http://alva-construction.com/uploads/1/3/0/6/130620666/074c64353.pdf
    • http://amurny.com/uploads/1/3/0/4/130488696/pebegozuz-somotigatapitu-zebafu.pdf
    • http://buffaloroofcleaning.org/uploads/1/3/0/7/130776069/mekozewat.pdf
    • http://ratigans.com/uploads/1/3/0/5/130551401/f8310b758974.pdf
    • http://gkgtraining.com/uploads/1/3/1/4/131438330/zizuseletewulasagu.pdf
    • http://drpind.com/uploads/1/3/0/6/130604276/nirekorid.pdf
    • http://dianasinsurance.com/uploads/1/3/1/1/131164414/878324.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_off000070a4.bin
c10d325f1f1a479aa9854ec7c70e3aa6669ffbaac52a5e4a8cc3cfcac3e1b8b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A4 9364 bytes

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