Malicious PDF — malware analysis report

Static analysis result for SHA-256 49622cae703cd71a…

MALICIOUS

PDF

46.1 KB Created: 2020-08-28 23:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d824bf68ae612c6e41c6b0f22abb986 SHA-1: e4c36056e998ac80e3ffab6759d1f2b3cf9f4eed SHA-256: 49622cae703cd71ac71437ab534d6cb48dbe3ccabd2699de6d5c7e1502c0ca21
160 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, which is disguised as a search result for '7zip for windows'. This, combined with the heuristic indicating a password-protected archive lure, suggests a social engineering attack. The file also contains a large number of links to static.usrfiles.com, likely part of a link farm to improve search engine ranking for the malicious lure. No scripts were extracted, but the overall pattern points to a downloader or phishing attempt.

Heuristics 4

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=7zip+for+windows
    • https://static.usrfiles.com/ugd/b8c837_31d8b11be27e4e3fba4150704e3391fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b55a81714a74976b0b84c4e3d273943.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac947309aaed413a945ce7c4bb124e90.pdf
    • https://static.usrfiles.com/ugd/b8c837_d82adfd76b7f42a78f74ed560df4652e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8ade5e9a72a46d2a013f43be6f77b37.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ac67685347c418a8d01357a5a585f4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c23f1188a5154b8980cb8176da2cb52b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8f2906ae8a04caa8d393c15974df4cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_362636c542d14cf99d234a49f50086fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_baae777784bb4397a14ffd8809009b05.pdf
    • https://static.usrfiles.com/ugd/b8c837_0399333a34a74fe2886e000b8b12b952.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed59e422ec054ee081e18de4f03e6c5c.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_off00007766.bin
778c94e69aee215cc2e73405dba51263acf5ac3583902a3edec315cf4fbda805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7766 4920 bytes
font_01_sfnt_off00008855.bin
6be0cdcc0c0e3c4042ba0e0bcd0f0001172548a5ab16816517401af67f46b059		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8855 10444 bytes

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