Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09cea5325238f6c…

MALICIOUS

PDF

40.8 KB Created: 2020-09-01 01:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4af0f8f1674e52af6325f41fed34f5b6 SHA-1: e6583b4ad6d5fc58639308a08971cc2ee01555df SHA-256: a09cea5325238f6cd767b6a3b92e8c30afc217df984791e52e977df54f3fc79b
120 Risk Score

Malware Insights

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

The PDF contains a deceptive lure for free knitting patterns, but the embedded link redirects to a known malicious redirector. The document body is heavily obfuscated, but the presence of the malicious redirector and the link farm heuristic indicate a phishing or redirection attempt. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic directly points to the malicious URL.

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/pify?keyword=free+aran+jumper+knitting+patterns+to
    • https://static.usrfiles.com/ugd/d1c05f_5697fe3800d441c788586ff2969e572a.pdf
    • https://static.usrfiles.com/ugd/f63f29_0dac4891c71a4ba1b9f4163e4cb4a319.pdf
    • https://static.usrfiles.com/ugd/cafc24_6dbee407c3794b4da8657d6caa9922bd.pdf
    • https://static.usrfiles.com/ugd/2c608b_afd9ba87d385475e9db414a3a396abdb.pdf
    • https://static.usrfiles.com/ugd/7598fa_80680127e7594737bd823c8484f29180.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba1f802286d44e0090a49df6032326b3.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_9312ec2642634e3b92068db3b8f59553.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d8a2d61ca7443adb6fc1a05c5d2f4b2.pdf
    • https://cdn.shopify.com/s/files/1/0434/4931/9577/files/31228615894.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/zonedidekomud.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/i_am_discourses.pdf
    • https://static.usrfiles.com/ugd/defcb2_5542bed216ca44bdbb0445d32455f106.pdf
    • https://static.usrfiles.com/ugd/856cea_3c7b85d4a83a49b9a093dcff2a901834.pdf
    • https://static.usrfiles.com/ugd/7e6083_c479ef2d28aa4dbc82f118c3ed2a896c.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_off00006215.bin
e9edd3879c7bca6350f9232dd3f90a7b6fda4479daf8fe6bafc7240f6a752ad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6215 5204 bytes
font_01_sfnt_off000073c0.bin
fb85ccc6ae52cf4950278dfe097e26c1b30e892e6dd97ef8ba91972b0197f0a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C0 10080 bytes

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