Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a2d560b1876e03…

MALICIOUS

PDF

39.4 KB Created: 2020-09-08 14:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ae461732be0238281a7ceac8dddfaef SHA-1: c5560b355f629ee3024ac309bfd7a22628f53df3 SHA-256: a1a2d560b1876e03771f3b661dd8d20f9084011dc460d3084bb329c0c55bb429
150 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm and a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL "https://ttraff.link/wix?keyword=answer+to+what%2527+s+up+doc", which is likely intended to redirect the user to a malicious site. The presence of numerous links to static.usrfiles.com, even though marked as benign, suggests a link farm strategy to potentially improve SEO or distribute traffic. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=answer+to+what%2527+s+up+doc
    • https://static.usrfiles.com/ugd/2b25b5_cfaf4869ed794eb29ba01ee37f4d1853.pdf
    • https://static.usrfiles.com/ugd/9a242c_2d59509f83e34f9eb69daed90273eef0.pdf
    • https://static.usrfiles.com/ugd/2ca09c_937547b3fca54f2b9d4f4ca26a193247.pdf
    • https://static.usrfiles.com/ugd/9cb927_b6d1ed107fe44de482508a7fcb55ace6.pdf
    • https://static.usrfiles.com/ugd/ebc5f9_01e66d4da1474812a11950e88419f56c.pdf
    • https://static.usrfiles.com/ugd/63022f_549a324ed61842e1a9bd04ec1d24f555.pdf
    • https://static.usrfiles.com/ugd/f64db8_b9ccde9754b14b48bad06331fdd866c0.pdf
    • https://static.usrfiles.com/ugd/f8de3e_0092aafa0d864af1bb7a5caed8efe460.pdf
    • https://static.usrfiles.com/ugd/1df9ea_17e2e5eb0a8040ebb7b3f0e17a2e2b81.pdf
    • https://static.usrfiles.com/ugd/838e7e_27c2752184464c2cb55db194fd609b38.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_off00005cd2.bin
a96ba704a4e4d8dfc78a027adcb7736f3b8e56013d157a7dea405599d258d2d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD2 5244 bytes
font_01_sfnt_off00006eba.bin
5574bc1d989fcdcc60461d848e5663ef8d64b3b3dc61edfd128eefd572cb0f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBA 10060 bytes

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