Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46ddc9e4be38ec4…

MALICIOUS

PDF

41.7 KB Created: 2020-06-16 08:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3046c06b23caa1d0c6a8015439025e74 SHA-1: 39b2bd74a6053d6d3218921686ffc4425ed0fe62 SHA-256: c46ddc9e4be38ec493f78b9d2a000c36bd5bccb6600539a5f7e0d9b48b65aa5c
72 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on unrelated domains and appear to be part of a link farm. The document body, though partially corrupted, contains text suggesting it is a worksheet, which is likely a lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and 'PDF_URI' points to a specific suspicious URL. These findings suggest the document's primary purpose is to redirect users to potentially malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bocaiyizucangjitu.br3h.com/uploads/1/3/0/8/130813403/130813403.html#simple+past+irregular+verbs+worksheet
    • http://nashmortgage.com/uploads/1/3/0/4/130490078/7608829.pdf
    • http://mail1.perfectpairmeals.com/uploads/1/3/0/6/130605238/7378904fb.pdf
    • http://miscmgmt.com/uploads/1/3/0/5/130548152/temamozevape.pdf
    • http://brainbrandllc.com/uploads/1/3/0/7/130739817/4557845.pdf
    • http://transformengineering.com/uploads/1/3/0/5/130540699/wulipamoderin.pdf
    • http://greenyourstyle.com/uploads/1/3/0/7/130775337/94631.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000642d.bin
38c3e71fdcd17c8f620972086cea42ee30215ec0907d571edc273a716888d48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642D 10292 bytes
font_01_sfnt_off000086fb.bin
313c3940a6f4aae92ceaa1b1a843de6e6f13411355a457aba6e018c383fce54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FB 16060 bytes

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