Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa0dc9e0ecd48e6…

MALICIOUS

PDF

44.6 KB Created: 2020-04-21 00:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a255bd052b50b9043eb7faecb426bb23 SHA-1: 2afbbe7f92b36baebc1935ea4ac534c4ddc72670 SHA-256: 4aa0dc9e0ecd48e64411067d8ebf77947ae68238fd56e52b9dee5005ae410feb
92 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for SEO poisoning and driving traffic to malicious sites. The document body mentions 'Android one software update policy', suggesting a lure to trick users into clicking the provided links. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports a malicious intent, likely to redirect users to a compromised or malicious host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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
  • 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://mccorkleagsales.com/uploads/1/3/1/4/131409210/131409210.html#android+one+software+update+policy
    • http://owethu.net/uploads/1/3/0/4/130435743/9508f919e87.pdf
    • http://ezcakes.net/uploads/1/3/1/6/131636677/defijizumomo.pdf
    • http://slysit.com/uploads/1/3/0/5/130588589/vubukaxiperez-vasevufuzavubuz-balag.pdf
    • http://mafitzdesign.com/uploads/1/3/0/2/130289589/woraxuxokurizinax.pdf
    • http://empirerealestateinvestment.com/uploads/1/3/0/6/130604834/32c37.pdf
    • http://dhfempreiteira.com/uploads/1/3/0/6/130620813/84b00074.pdf
    • http://amywahlstudio.com/uploads/1/3/0/5/130551140/a2a96244a.pdf
    • http://3girlscraft.com/uploads/1/3/0/6/130605097/52c4fdfcb8.pdf
    • http://michellestevensphotography.com/uploads/1/3/0/4/130483981/4348630584cd0.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_off00008436.bin
d12fc3b308d1e6a673bc3698c6b8336060cf462fd31bdcf558d0b87c8b0eeb2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8436 8932 bytes

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