Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff9596f61b885a3…

MALICIOUS

PDF

34.3 KB Created: 2020-09-02 19:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca42aaf435353f7e72c2881675024e38 SHA-1: 95e0efd08daafce84adeaa2dee840270b971d3b9 SHA-256: 8ff9596f61b885a395b54da41854d0583cc06038a0ce739f175a7b376a261500
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'curry sauce nutritional information' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a PDF link farm heuristic further indicates a malicious intent to distribute links.

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.link/wix?keyword=curry+sauce+nutritional+information
    • https://static.usrfiles.com/ugd/9df9d6_b78f58913c5f465baaf5734b3f54d1b9.pdf
    • https://static.usrfiles.com/ugd/f90bad_7bc7e3e347a244c087d3b17f00ff4ecc.pdf
    • https://static.usrfiles.com/ugd/02beb7_be77fca63048478bb14a426cfbb61906.pdf
    • https://static.usrfiles.com/ugd/760a88_6e632ad53f0547a2812ccac414da8475.pdf
    • https://static.usrfiles.com/ugd/aef5b7_7d15ee451cb84ec9bca9ced462c2afb2.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_dc7e1017479d4d3da782c750e523a1be.pdf
    • https://static.usrfiles.com/ugd/63d3ad_3cc206a8ccec47f2b0bfa33aa4db5f29.pdf
    • https://static.usrfiles.com/ugd/b8c837_e00a3a6dbe5044e19e79717ded6e2396.pdf
    • https://static.usrfiles.com/ugd/7ff653_5ee294af794940d392f74d7c497cdb95.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_f55df5056dd341b4957fa8272744f958.pdf
    • https://static.usrfiles.com/ugd/3ce946_2974deb217384ebfbc5e9f18a26dfc74.pdf
    • https://static.usrfiles.com/ugd/b8c837_83065d9ecf9b4092bf1dee369d265a87.pdf
    • https://static.usrfiles.com/ugd/4b874d_aebf990fd37c4defb9e6fd3b6c438ca1.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_9f3680fd1ef54147a62fb00f452aedf4.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_off000049c7.bin
11378b828c25336e473435f81b8478d70da087c37fbe5bcc3ee47d84450c2c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x49C7 5032 bytes
font_01_sfnt_off00005ad8.bin
90a661800a626463991af690ac4fec116a514c22201fc0f6ed222a3ef8030a66
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD8 9832 bytes