Malicious PDF — malware analysis report

Static analysis result for SHA-256 851c899bc6c1c76f…

MALICIOUS

PDF

37.1 KB Created: 2020-04-28 15:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: aa7e2d52c3b21a2dbe4f5fd3183ad351 SHA-1: 99691c8d6a391b77ef43157e2cc7bf8373eaab30 SHA-256: 851c899bc6c1c76f329318d18cae86fda10fcca27d0c2ba8fa91aa3d725c0b30
92 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files hosted on various domains. The document body mentions 'Nikon shutter count apk', suggesting a lure to download potentially malicious software. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://mryanki.com/uploads/1/3/1/4/131406253/131406253.html#nikon+shutter+count+apk
    • http://abicakeshome.com/uploads/1/3/0/7/130775018/xozowexokoje.pdf
    • http://prolinelifepharmaceutical.com/uploads/1/3/0/8/130874258/fugutolasivuxagubi.pdf
    • http://mrmay.info/uploads/1/3/1/6/131606859/pirofav.pdf
    • http://ffassassins.com/uploads/1/3/0/4/130477110/2576e.pdf
    • http://kirtoday.com/uploads/1/3/0/7/130775052/pazobetivolag_powixezasow_karawatofe_kubezatezabo.pdf
    • http://lakesareaelectricinc.com/uploads/1/3/0/6/130621406/gajituj-zikiluz-rivajejowozawe.pdf
    • http://joyouslyraw.com/uploads/1/3/0/4/130483753/wapogo_kibixizuzijage_vadimujowezifi_kexafumeb.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_off0000694a.bin
7e7f114e2394576ad4723b583e55b9c0d0a68f95815f05831c396131663041cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694A 8256 bytes

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