Malicious PDF — malware analysis report

Static analysis result for SHA-256 836d5d2b3df00984…

MALICIOUS

PDF

39.6 KB Created: 2020-08-30 04:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85d239fa079cb510db01ad50fc6f3646 SHA-1: e830c182892dc8e5ba6d24b36ec2ac1e0312b34c SHA-256: 836d5d2b3df009845866bdb94246de7ff2be138764897643ea5a8fd326d21744
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs. One of these links, https://ttraff.cc/wix?keyword=for+the+king+woodcutter, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and references to external PDFs, supporting the link farm heuristic. The primary attack vector appears to be social engineering via a deceptive link.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.cc/wix?keyword=for+the+king+woodcutter
    • https://static.usrfiles.com/ugd/b8c837_7f1c85de66dd4687b694c5f26e3a0ccd.pdf
    • https://static.usrfiles.com/ugd/d1d005_7a3432b1869d4426a3bd2f143cb73fe8.pdf
    • https://static.usrfiles.com/ugd/158fb9_85b5a3c97b1b4bdd927f71a3bdad4878.pdf
    • https://static.usrfiles.com/ugd/6846fe_12f05b25394f45378e1c9080b7640ce1.pdf
    • https://static.usrfiles.com/ugd/b8c837_eed5214769894018ade179f2bcb6e221.pdf
    • https://static.usrfiles.com/ugd/4b7290_f143fef187d841c892187f014c0a9740.pdf
    • https://static.usrfiles.com/ugd/07ef24_2b51ea97609442f38f11ab3a53cfb1b7.pdf
    • https://static.usrfiles.com/ugd/fd3290_8123d6c303e74fe1a0b96f38e374c254.pdf
    • https://static.usrfiles.com/ugd/4b68be_c6ea351f9ad04924be985f8d30d2e236.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_off00005fd0.bin
c02e6f15734429360d62cbc89bc694455709975d4e4125033e5e6d220d46af0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD0 4892 bytes
font_01_sfnt_off00007087.bin
35de57aa74dd31a6a1976e6ee0c3254660d687dc2df0f41602a4ba6b6babfacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7087 9980 bytes

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