Malicious PDF — malware analysis report

Static analysis result for SHA-256 8750b60c5f17ec96…

MALICIOUS

PDF

54.4 KB Created: 2020-08-31 13:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33f51e48748908d30f47dd2703987e42 SHA-1: 96d9f6541569263e4f58e67013a1f44b21940c59 SHA-256: 8750b60c5f17ec9637637bd619b58592f332e41113026e2d5a65cb15e08c6900
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector, which is part of a link farm designed to host numerous other PDFs. The document body is heavily obfuscated but contains a URL that appears to be a lure for game-related content. The presence of multiple embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

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=zelda+breath+of+the+wild+elixir+recipes
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/de65f7_41a236ac64904a89b8845bfec6b458d3.pdf
    • https://static.usrfiles.com/ugd/6cfc61_8996a9c04db047cdae2e3b3040def74a.pdf
    • https://static.usrfiles.com/ugd/271e65_1b1656fdbb724bef9f149b498c719606.pdf
    • https://static.usrfiles.com/ugd/784815_86a382e67cbd485aa5a5cba80837fe96.pdf
    • https://static.usrfiles.com/ugd/c1108c_15b05da2376d44d590f331f01a8ca99a.pdf
    • https://static.usrfiles.com/ugd/7603ae_8c4abf3ad7c348a4a1d93ad954008839.pdf
    • https://static.usrfiles.com/ugd/b48b60_1d9a12de56b64a8bb67ddb5ec83aabb9.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_1c7188804cb94a2b86b94421c31da6b0.pdf
    • https://static.usrfiles.com/ugd/0c41e7_0aa7a6df321848d99e1053e255df64fe.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_3baf14fcff46435480210ab1865d5bae.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_fd3b89a51aed4ce79f65af2a1c1061df.pdf
    • https://static.usrfiles.com/ugd/de02f3_7c1ef60f223b477ea05e0ac5864f7889.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000818f.bin
8c436394f6432aae132f69feba07bb6736a71aabacee2c6ac16d3f4e201596a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x818F 5500 bytes
font_01_sfnt_off0000944f.bin
173eb9b40e50634fb663a5d437822bcdde0e34582dda56271261f60fd54f899f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x944F 10396 bytes
font_02_sfnt_off0000b786.bin
3f70697d8cfd0b9becff5adcad726f9ffedcc5d773cc6f7abbcc82b2f8034994		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB786 16164 bytes

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