Malicious PDF — malware analysis report

Static analysis result for SHA-256 f965920a8b7578a2…

MALICIOUS

PDF

71.5 KB Created: 2020-08-29 03:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd4be29c3291965a0831a7916a0c5924 SHA-1: 8f6925fff1034d5549c8c9cfe4ad6af905ad1bc6 SHA-256: f965920a8b7578a29ebecfb4d3dd003294845a5a318da61fd41484fe309d66fe
152 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.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of compromise.

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=c%25C3%25B3mo+el+grinch+rob%25C3%25B3+el+gui%25C3%25B3n+de+Navi
    • https://static.usrfiles.com/ugd/b8c837_37dda59325b84745b1f6d33c61e9f468.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2dadf8565b74eac89d806d0b8fb657c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e3b2b490fa644d5b36320bc24f030d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_33bf9ed1604e491bbb328ac403b7ec51.pdf
    • https://static.usrfiles.com/ugd/b8c837_d05b261dc6324c4b91c9ac9f6ec26692.pdf
    • https://static.usrfiles.com/ugd/b8c837_381821c13eea4a398b333fa93cc4ae01.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab6f624208d14055b47fa3dfeb5fb1d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ef12abd6e7b45b7a467773c1fd6f4e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd8ad63ecae84ffc85b9a3f23ffe319e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0d1465147984e98a0fc0aa581cad539.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a844f21c1624ec0968bceebf0a1ccdb.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_off0000c6df.bin
62bc6a30a316bc1f2fe3dda094b6573d1b4a0fa19983427e205f29fd900ed230
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DF 5400 bytes
font_01_sfnt_off0000d8cc.bin
f189ad3e97b2d74d474879f249d14e1ba08ff825eb1798c6c44318b99dcde820
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 12372 bytes
font_02_sfnt_off000100ab.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 4324 bytes