Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ddbd0384610018…

MALICIOUS

PDF

72.1 KB Created: 2020-08-31 13:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 088a90ce341090cfa9932e3bba8d1a94 SHA-1: 19d04a6667da62d372fc7ca2d5b2e31e0211a77e SHA-256: c3ddbd0384610018785b27d67f3d1d79afe4395e2bb0d0e870a6cd18670200dc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=critical+limb+ischemia+guidelines+2019', which is likely used to redirect users to a malicious site. The presence of a large number of embedded PDF links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning attempt to drive traffic to the malicious redirector. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=critical+limb+ischemia+guidelines+2019
    • https://static.usrfiles.com/ugd/b8c837_3297023679d549498317115d8b4c9a26.pdf
    • https://static.usrfiles.com/ugd/5e81b9_5dcbaa77726041daa0e6312898c810f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_87cbba97ed3043f890761bdf6991f9dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3432394b27c49f6849e96a7c898cee8.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_57e65f3925a149989af41c88e6db1342.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6a9c76e23574a8d8e6dcfbed89c3fa2.pdf
    • https://static.usrfiles.com/ugd/eb4c03_539e1d75bcca4969a87b6643b3b75b81.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_443190bdacad4a469e6e1f83981c0ea7.pdf
    • https://static.usrfiles.com/ugd/4ae4db_10e050575f1948bf9df279c2c349de52.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa89c02855b941628bacb9b8834f225e.pdf
    • https://static.usrfiles.com/ugd/b8c837_784ab9ff4f1f49e38983d04f34a910e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd612951ca1747b4a411d83b7988187c.pdf
    • https://static.usrfiles.com/ugd/5b9365_c1c7261cbd9e4cb287d45c86015255d7.pdf
    • https://static.usrfiles.com/ugd/f55bec_acd52f9477b54cd098d5a2fca1070dd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_7833f64966f34f469fad80d53459a300.pdf
    • https://static.usrfiles.com/ugd/a4e402_03fb34ce2fd84a4ea92e53d0db7949d0.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_off0000d8fc.bin
445a14b169b992d8393f76d2a571853d4ed36e3ca52f895057ec045e112c4e9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 5880 bytes
font_01_sfnt_off0000ecc7.bin
7c5e089e89f19aab67a5c179e86f6119b5badee0610b3a675063cec2bbb1f071		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 11820 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.