Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce33130e4e78f28…

MALICIOUS

PDF

41.5 KB Created: 2020-08-30 09:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae0e1b04aaccc2786f3026c085389608 SHA-1: 55bbd0ddb42e414a5aedddd10b99d4c9dc89b62a SHA-256: 9ce33130e4e78f28174564f9daed39c9ef6eae08f567170d62ac0134ab1f85a7
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is presented within the document body, disguised as a link to download a font. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify and static.usrfiles.com, likely for SEO manipulation or to obscure the malicious destination. No scripts were extracted, and the document body is heavily obfuscated, but the primary intent appears to be redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/wix?keyword=proxima+nova+semibold+font+free
    • https://cdn.shopify.com/s/files/1/0466/7411/6773/files/5380003725.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/fields_of_barley_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/8051/4726/files/gta_san_andreas_cheats_pc_download.pdf
    • https://static.usrfiles.com/ugd/87fdc7_77131a8ece7a4c169f9719b1e81b1f27.pdf
    • https://static.usrfiles.com/ugd/d162e3_c32e78fcd65a484da310e47b07f9adce.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cd13bc5671c41d9bfb1df8e0549c6cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3f4a0e144e5436d86d7252bc50e2254.pdf
    • https://static.usrfiles.com/ugd/b8c837_add5c080a3664950809aec2effd32aa5.pdf
    • https://static.usrfiles.com/ugd/de60da_5445e9fdb2bd416e8cb77bb0aa9b40b4.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3178/files/netomutike.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/13067973954.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_off00004948.bin
4a41359d941dabfe0b40653285e2c162439da272c0a901d675299ae2b9b6b49f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4948 5324 bytes
font_01_sfnt_off00005b3e.bin
5199df5c83d2bc55fa2463bf21142cef33f8ff3794416a6279673ed09428cbf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3E 10960 bytes
font_02_sfnt_off00007efb.bin
0bf57c6f7b87765c042c5fb6a8d0ed4ebb7dcd80100e1bb7a14eb0de07576921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFB 17472 bytes

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