Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a8b7feb667506c…

MALICIOUS

PDF

41.3 KB Created: 2020-09-03 03:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f35c8d166d1d28d2590ed97b13b1280 SHA-1: d3c9ea0512828eb64dbe5b919c09ce4a26a1e0cb SHA-256: 58a8b7feb667506c8d373d2fb7dde74d1993069006a764930c92a0c5dc65eb4a
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=tds+tax+challan+281+excel+format'. The document body, though partially corrupted, also contains this URL and references 'Tds tax challan 281 excel format', suggesting a lure. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to static.usrfiles.com. The primary malicious IOC is the ttraff.link URL, which is likely used to redirect users to a malicious site.

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.link/wix?keyword=tds+tax+challan+281+excel+format
    • https://static.usrfiles.com/ugd/4bdc6d_721ac1a32a324741817900bacf32a217.pdf
    • https://static.usrfiles.com/ugd/b8c837_00b3841e60a445598df8d3c5c2635e84.pdf
    • https://static.usrfiles.com/ugd/2274a7_91f0131123c24c6d9b92f358290b6587.pdf
    • https://cdn.shopify.com/s/files/1/0432/9478/5704/files/20368135936.pdf
    • https://static.usrfiles.com/ugd/f09a9d_21cd4446b7c748659191507b3db1d493.pdf
    • https://static.usrfiles.com/ugd/04c368_9c517b4a6fda465da3938f222df59b1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_33addcbd8a7c4947b9607219c9691ddd.pdf
    • https://static.usrfiles.com/ugd/b8c837_b97a0e3b72dc47ab8d3b8cce4610559d.pdf
    • https://static.usrfiles.com/ugd/f4de5e_2ff303d112244dc7a3637df7d9d1736b.pdf
    • https://static.usrfiles.com/ugd/a48928_13d3b265ad1049e3ad82afe858924bb1.pdf
    • https://static.usrfiles.com/ugd/0c268c_ee684966039c46af94f43a732bd3e383.pdf
    • https://static.usrfiles.com/ugd/cec570_a2f294af71da4420a9246f7003efcfb6.pdf
    • https://static.usrfiles.com/ugd/accd1f_5dcadd9d2ce64dcab92d9e5c78896236.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_off00006306.bin
798f856de9b7b151221e08bb784ecf93784cbcd7cee6b7256ee0168ac42f4b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6306 5656 bytes
font_01_sfnt_off00007626.bin
0ddefc24f85f3bd4d736aa4d0d188f066cae151084e32f5b52445cf596ec21e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7626 10020 bytes

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