Malicious PDF — malware analysis report

Static analysis result for SHA-256 665e07d4864714f6…

MALICIOUS

PDF

233.7 KB Created: 2020-09-10 06:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d92c633ca5f3a05c55a03edd190facb9 SHA-1: 33457026ce92f7dcf807b740c0e4b9ac1e961144 SHA-256: 665e07d4864714f6694da323e804b8ff085d2a593e33a28b556b6666f0e63506
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL, https://ttraff.ru/wb?keyword=40k%20codex%20pdf%20vk, is the primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.ru/wb?keyword=40k%20codex%20pdf%20vk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/771ea4_8df9abfb955c4fa687bebe91635bc4ad.pdf
    • https://static.usrfiles.com/ugd/5b9365_4a50f76c37ff4b86a765d77f5406479c.pdf
    • https://static.usrfiles.com/ugd/143c98_b7a5ad65ee3a448592435a45bafe43df.pdf
    • https://static.usrfiles.com/ugd/b8c837_3675fb5c98b3446fbc976eeab6f6743e.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_30d24cb0c9ae4933b4f367f1a216671d.pdf
    • https://static.usrfiles.com/ugd/54dfea_fa162a2149ab4de89f72a5b5cec9cf4b.pdf
    • https://static.usrfiles.com/ugd/48f461_5d8a3c11e53146e58a35dcb714f1823c.pdf
    • https://static.usrfiles.com/ugd/217b8a_1b223531fb974c6b956817b7364ef083.pdf
    • https://static.usrfiles.com/ugd/b8c837_14104f3d5adf4f858db1a113b1010be9.pdf
    • https://static.usrfiles.com/ugd/225520_f31a2d0b7eb34838b5fdaab554cc1916.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1585/files/panupamikapikux.pdf
    • https://cdn.shopify.com/s/files/1/0436/5526/6457/files/jamodibutusevuvik.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00035e34.bin
da6acd5330e3eedea09f3bd7063adeaaff1a89f7b24741e3e22f0b4922cb0110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35E34 4960 bytes
font_01_sfnt_off00036f43.bin
c70af4ef03cdf6dc7b61dcc0a5f314629c0ff6f4125bda60d20563a98f3a0512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x36F43 13532 bytes

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