Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c3b65e014ba340…

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 17:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 233ee6dd5d1de983b6d9538520ed2258 SHA-1: 3e884172b653971a0c52eb3a679403f5a4141670 SHA-256: b8c3b65e014ba3404fd15f6e17228252e790bff3ca41934703449bbb4e610d82
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to potentially malicious content, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing. The embedded URL https://ttraff.com/wix?keyword=ark+survival+evolved+ipad is a primary indicator of this redirection attempt. The document body, though heavily obfuscated, contains references to the same URL and other PDF links, reinforcing the lure-based attack pattern. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=ark+survival+evolved+ipad
    • https://static.usrfiles.com/ugd/daca0d_f25e0f9484e74612897caaebbe0e0b36.pdf
    • https://static.usrfiles.com/ugd/9904c2_cc937bd1aea340b1b2d6ff2136634783.pdf
    • https://static.usrfiles.com/ugd/a43ec6_5768b16c445142ab8d83e031858e37fb.pdf
    • https://static.usrfiles.com/ugd/6290de_47033329945147d5a93548c16b7600f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d34c880e3b14f44b39ab8d267b25c3f.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_63676b0b8ab74e219859df67e0f57d51.pdf
    • https://static.usrfiles.com/ugd/9e53d4_d0b19cfe23e645c9b605c9d4b9600206.pdf
    • https://static.usrfiles.com/ugd/f96b02_6f725ea61c8d4cc58b22909b6e0f07cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_b40b8ef7fa444bfaabceeea16bc1e6e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_132628c7ef364e36a9117a681bf6acdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f61249fa6624d07845a4c39966fb93e.pdf
    • https://static.usrfiles.com/ugd/dba42a_d6c489a295754f01a961984a9384e44e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1e65132d22e40e49b5d033b17b4eb19.pdf
    • https://static.usrfiles.com/ugd/3649d2_026c94f07b624ad6a7774ecf3563ddd4.pdf
    • https://cdn.shopify.com/s/files/1/0459/9178/8706/files/offline_autocad_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0454/2785/1422/files/6205846389.pdf
    • https://cdn.shopify.com/s/files/1/0429/6173/1743/files/lenalinukofagozije.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_off00006ffc.bin
5b4ea7cacb64eae6e2e8ebfe9f15aacb5bc79fa0338d443acdf61b6531d743b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFC 5068 bytes
font_01_sfnt_off0000814f.bin
2655dcff935069f6a361c9c4f0c912c944a79ee7a786c2f3182197be11cd6fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814F 10524 bytes

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