Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40c536b5f694f11…

MALICIOUS

PDF

39.8 KB Created: 2020-09-01 07:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59d91877cb87c7cf1268a76edfdab029 SHA-1: 44a9b52ab796dba1d2c56ff0ffce910de5df50a8 SHA-256: b40c536b5f694f11819fde35add7c898c6d9de18e5e22983ab68a0bc897024d3
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, pointing to 'https://ttraff.com/wix?keyword=bossa+nova+piano+sheet'. The document body, though heavily obfuscated, contains references to this URL and also lists numerous other PDF links, suggesting a link farm or redirection strategy. The primary intent appears to be directing the user to malicious infrastructure under the guise of providing piano sheet music.

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.com/wix?keyword=bossa+nova+piano+sheet
    • https://static.usrfiles.com/ugd/9cfd0a_be7b0aad32f244c8a819a9050bf871fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe0b654dd6f3450fa4922c0acb5911b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a260537d8644b40bfbab4801e197c7f.pdf
    • https://static.usrfiles.com/ugd/111c46_9661d83102ab4dd091dff13989fe8661.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/wupudires.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/62711873821.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_473445c4f2634a7e8523934820880d19.pdf
    • https://static.usrfiles.com/ugd/3e9e83_715735306c49474e8c20bec6969bf6b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4fafe1556de04878b0877aa3f90d2071.pdf
    • https://static.usrfiles.com/ugd/dd4472_07f8f0bad4004203afe5a7afca9c99f1.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_off00005f9c.bin
f8635c7779981bf91e146289fdee03d649672c3fee1af1f1a5335aaaac2ff381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9C 4888 bytes
font_01_sfnt_off00007049.bin
e2d781b3dc992ad0ccab34deef5429e0484c3243918d78d29e6f102cf33e4aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7049 10224 bytes

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