Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ff744be02fd382…

MALICIOUS

PDF

44.7 KB Created: 2020-09-01 20:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8140f497170c8d623d9cf430055e654c SHA-1: 74484739732345bcae711943a6d0c93a84c422ec SHA-256: 23ff744be02fd382f3f546c0e2175e4c755fa3c13a2ec562057d940c885da0cd
120 Risk Score

Malware Insights

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

The PDF contains a link disguised as sheet music, which redirects to a known malicious domain. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or redirection strategy. No scripts were extracted, but the presence of a malicious redirector link is a strong indicator of malicious intent.

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=muse+invincible+piano+sheet+music
    • https://static.usrfiles.com/ugd/b8c837_14f1dd89131c460bb4c0268c1c5dedf3.pdf
    • https://static.usrfiles.com/ugd/f09a9d_746818e33ef6472eac92480ca6c9f028.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_616eec75958d4fe48ad3e1acb4772057.pdf
    • https://static.usrfiles.com/ugd/ab059d_b7ef02e8ef784b14a3062ade6893ada7.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f3eccaf156e4af7859294b9918a49ba.pdf
    • https://static.usrfiles.com/ugd/b98abb_d7f37b2ca1144ef1bf5cab6a2ca7dacd.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/78967561882.pdf
    • https://cdn.shopify.com/s/files/1/0431/7587/0613/files/bemogutipemuv.pdf
    • https://static.usrfiles.com/ugd/9734e7_bcd8c30e7fdb479ea20d29b48b5d436b.pdf
    • https://static.usrfiles.com/ugd/b8c837_689010bd39a84e718e84fb138cc4b236.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fb5.bin
4762e667c95432f0df79a33e99eefa67a5fff45bdbf3d7a9513858b8b5e6e2ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB5 6588 bytes
font_01_sfnt_off000065e5.bin
963f3bb03324fd6a69cefb8ab3681202b135f0f77089893143f4578ea5139d16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E5 5280 bytes
font_02_sfnt_off000077c8.bin
dc442576dcef19ac225a2ac6ea91143932dff257f767b0a170812aa4231a4d88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C8 14612 bytes

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