Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdff05f998ae46d…

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 05:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e6b8fee475c29e49a5dcb39cde0d931 SHA-1: 964b42cbb0e4ccc02ae723d8c561c25d450a3fc9 SHA-256: dbdff05f998ae46d5653a0df9eadfd161f1660d14d7d2e8800643f51fe09945f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is 'https://ttraff.cc/wix?keyword=de+jager+Roller+heerhugowaard', which is likely used to redirect users to a harmful destination. The document body contains numerous links, including the aforementioned malicious URL and a large number of benign-looking PDFs hosted on 'static.usrfiles.com', suggesting a link farm designed to manipulate search engine results or distribute malware.

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.cc/wix?keyword=de+jager+Roller+heerhugowaard
    • https://static.usrfiles.com/ugd/33a2e4_52c1e2f45731405e94ce6ac3b15fd044.pdf
    • https://static.usrfiles.com/ugd/0c41e7_26f22391847348c080bbdebd1c079f8d.pdf
    • https://static.usrfiles.com/ugd/808d8c_243f866d0bcb404fa14f165404dd6087.pdf
    • https://static.usrfiles.com/ugd/0a593f_59dea0ad2a964b97a42c4b432fa8f6b7.pdf
    • https://static.usrfiles.com/ugd/0c4177_e3c5cb95552449c3a1908f3026e20fdf.pdf
    • https://static.usrfiles.com/ugd/934fc3_d79b34e1a5184879b31b7384458466dd.pdf
    • https://static.usrfiles.com/ugd/affb4a_2a99aadad15a49f6870206d5a9a86572.pdf
    • https://static.usrfiles.com/ugd/fb83f1_302e9ff9483f4372a0669a1019866abe.pdf
    • https://static.usrfiles.com/ugd/c0b427_dddec99a84ae48bf86e2934bfb5d10f9.pdf
    • https://static.usrfiles.com/ugd/cc03df_9d5e3068510745d788738183dae72c65.pdf
    • https://static.usrfiles.com/ugd/b7ab08_0404c0d981954e129e4331616d67a879.pdf
    • https://static.usrfiles.com/ugd/83e24f_b862ce33af5a481ca8e432bd9649205a.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_off00004e71.bin
85422147bab1753899f72ccdec6452201e2d413c087306022602f5b30b24ce9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E71 5176 bytes
font_01_sfnt_off0000601e.bin
69e9a5f0da481da21c83910d7716f93db232c1b3ea109fc42a984b2fa2e6f281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601E 9860 bytes
font_02_sfnt_off00008213.bin
c9b9d40238817e9fd1c0b290bb100284b8f2d9dcc1188338581b9d27efa8fa30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8213 16392 bytes

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