Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2e114044e3ee4c…

MALICIOUS

PDF

43.6 KB Created: 2020-08-31 09:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 349494bd2a781a87faabd15ee11558aa SHA-1: a5620f3657f26fa85402a73ea734e62796759157 SHA-256: 7a2e114044e3ee4c4bd8c372b1cafed16df8bd82b88e54a2eec39ae0f0baf829
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=x+rocker+gaming+chair+setup+xbox+one'. Additionally, another critical heuristic indicates a PDF link farm, with numerous external links, many pointing to 'static.usrfiles.com'. The ML classifier also flagged this PDF with high confidence. The document body contains obfuscated text and the malicious URL, suggesting a lure to a potentially harmful site.

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.cc/wix?keyword=x+rocker+gaming+chair+setup+xbox+one
    • https://static.usrfiles.com/ugd/b58d21_dc893857fad441fa8f7b5a4304289742.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2bacb699132473b95a56e6745e9b6dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d430ccb5b81406c9a0a03817b608c0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_50199653541b47a692d79a1b27ef0e76.pdf
    • https://static.usrfiles.com/ugd/3e87bf_ce73541f94714dbe8ea4200f00ce50f2.pdf
    • https://static.usrfiles.com/ugd/ae059d_23c0273d17ff468aab52854ff004d1fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_8758fbd13a154e019d46c88081db4d8f.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_de9e4f80b2b744069dddff2f6ad9d9f0.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/komafibeworutorusoxuwijo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9405/6861/files/13457617971.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_off00006c34.bin
8a3cd042a443d1f4ce56c67db170323226a5365bba0aaca21f9d365091cc859d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C34 5564 bytes
font_01_sfnt_off00007ef0.bin
627172fe5742ac348417bbe717e2b6dbf6cac6363b0a1c54275eec30998fdd26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF0 10192 bytes

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