Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d926e1c0dbbe10…

MALICIOUS

PDF

35.2 KB Created: 2020-04-06 13:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: def1598a0bb73f3c975c8a8e39b2536e SHA-1: ec61931a75beb9e3e84359149d44ce7a1f77e34a SHA-256: 66d926e1c0dbbe103b6d8e0994ec42619e428b7424e86546e44ff3a497b39a8f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially garbled, contains text suggesting a lure to download a game, along with multiple URLs that appear to be part of this link farm. The ML classifier also strongly indicated maliciousness. These factors suggest a phishing or SEO spam attack pattern designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://spacecreationdesign.com/uploads/1/3/0/3/130379336/130379336.html#descargar+el+juego+de+la+bruja+gratis
    • http://project315.net/uploads/1/3/0/6/130620314/jodasojiberid.pdf
    • http://rhysbufford.com/uploads/1/3/0/5/130544754/tavubagogolud.pdf
    • http://creativeagencylosangeles.com/uploads/1/3/1/4/131406046/zexixibokole.pdf
    • http://sundancecafenederland.com/uploads/1/3/0/6/130620764/2819633.pdf
    • http://minervaslab.com/uploads/1/3/0/6/130621330/2178e.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_off00005e5f.bin
145703425f5c0f06107f29c26e31f98bc4ece391aeeca54c1f900d84c4df5969		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5F 8928 bytes

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