Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe4d007bf2e0026…

MALICIOUS

PDF

37.8 KB Created: 2020-08-30 18:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e221641946aae3cb3e01177fabe294c4 SHA-1: fbcae4738128fa9a293d236b1e39e834793e2a35 SHA-256: 4fe4d007bf2e00267f1e16ca6073c1cb307efbcd0716b38ec66406e9bf7c18c8
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm, suggesting the document's primary purpose is to distribute traffic to potentially malicious sites. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the presence of numerous links points to a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=i+manoharudu+naa+songs
    • https://static.usrfiles.com/ugd/c068f8_a1f3b6a90ae34cebbb994a397d9d8057.pdf
    • https://static.usrfiles.com/ugd/8d57bd_8423e3f39aa04791880fb7813e39c35f.pdf
    • https://static.usrfiles.com/ugd/5e81b9_8bfda31889e546bea82b7e6758185125.pdf
    • https://static.usrfiles.com/ugd/40512e_61cdffe299674b6990cb1d3cd2bd0836.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e8e8454c5ca4b17a035b86919f28ad0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7164653375814b81ac3ed7067aff12c3.pdf
    • https://static.usrfiles.com/ugd/8127dd_eb9a8ebcfa73409ebc88d679613eb3b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7c66bdfd47e45849508a83533fc6e57.pdf
    • https://static.usrfiles.com/ugd/10e3af_292656a1e7b04f43ab80ff692ff7e057.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cd4cb3a00ee47cca8d3479074a167e3.pdf
    • https://static.usrfiles.com/ugd/98e298_07c2770844fd4766aca561ce37e46b9a.pdf
    • https://static.usrfiles.com/ugd/02beb7_2ecf193842e24fddbd0fdcd9cc1aed1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_85610b545a39410487a610b3e7dfc8c2.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_off00004e7f.bin
6a94ec3bbaf26d8d35e7d54ab9db6e9cdd7582bdfcf0a61e1897b4eadfaff7de
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E7F 5144 bytes
font_01_sfnt_off00005fbf.bin
217bae7b8bbdf22b2dfb34f7ee4aa3c5309ef6e4d04a06a4e8d7f5e87a1a4b3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBF 13916 bytes