Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7d8f41292442bd…

MALICIOUS

PDF

36.9 KB Created: 2020-09-03 21:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea807b40275efc484a37cb67eb1d0c79 SHA-1: 9f957da1524aa6100c53f37268b3d93b8fbea794 SHA-256: bd7d8f41292442bd948102296589bac43c1b93925ee1673e65d6433c35daa25d
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=bcbs+kentucky+medicaid+prior+authorization+forms', which is flagged as a malicious redirector. This suggests the document's primary purpose is to redirect the user to a malicious site, likely for phishing or malware distribution.

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.club/wix?keyword=bcbs+kentucky+medicaid+prior+authorization+forms
    • https://static.usrfiles.com/ugd/f2c1dc_2f2567d02a4f4bc989ab3c61698bb9e6.pdf
    • https://static.usrfiles.com/ugd/bbd3cf_bc1d38309f354162b470fee918f4a613.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d3e9abb2b6948a4a38ce6d4ba5f8abb.pdf
    • https://static.usrfiles.com/ugd/cb4a18_9be137206e724390a4ea4497e2a6b40c.pdf
    • https://static.usrfiles.com/ugd/067ecb_986ffe4d33a44723b668191c03f9735d.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_274ef1532f77456e9d11a922f7dc868f.pdf
    • https://static.usrfiles.com/ugd/ecec20_b487f120c1b844d2ac171c82b70ccf5c.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/alphabtisation_en_cte_d_ivoire.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8242/files/psychology_books_in_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/50231272694.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_off0000462c.bin
d135361ac78a3cb659b70a3ccac160f9168e2b79d6c171792f79e6b12bda674c
pdf-font-stream PDF embedded font (sfnt) at offset 0x462C 5652 bytes
font_01_sfnt_off00005937.bin
4c0699aa5e83fbf8efe0295cca2f1eea4c71e5b53511b8f642fd00f2a7c611a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5937 9244 bytes
font_02_sfnt_off000078d7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x78D7 4324 bytes