Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd38691991e21fbd…

MALICIOUS

PDF

40.3 KB Created: 2020-08-31 02:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e264783212143c122463bf688c3c7e SHA-1: 257263c1f6573a1d848b1fbf66088e9cf3bc6704 SHA-256: fd38691991e21fbd8d25264e09022aaef4f4719f1bb83aa246358637febef104
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which points to a lure for downloading 'Nfs most wanted'. The document body, though heavily obfuscated, contains the same URL. The PDF also exhibits a link farm behavior, with many external links, and a heuristic indicating it's a password-protected archive lure. This suggests the primary goal is to trick the user into clicking the malicious link to download a password-protected file, likely containing a secondary payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wix?keyword=nfs+most+wanted+download+full+version+for+pc
    • https://static.usrfiles.com/ugd/dd4472_194bfc7ffef64382a642fdb6da357a4c.pdf
    • https://static.usrfiles.com/ugd/aa14a9_29bd22b6deb54d61a9f9d005df799699.pdf
    • https://static.usrfiles.com/ugd/b444d4_46a3b06a4a08468e9393c42e9e28ce0e.pdf
    • https://static.usrfiles.com/ugd/39cb9d_ef54e20540714a6d97a6b7a1fcbe9950.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/lixagizer.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5805/files/centrifugal_chiller_operation.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d9ffaeceb504c518a6638ab40a23277.pdf
    • https://static.usrfiles.com/ugd/8dde66_dc01e5fb7fb34084941d9db098c15aa2.pdf
    • https://static.usrfiles.com/ugd/c1de29_934c711670ba44258f9fb0c3fc783e51.pdf
    • https://static.usrfiles.com/ugd/913720_cf96e4502b0942e9a6107410823dd686.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_off00005fb8.bin
b635c9850a77cf1ec9c12aba9b42e74905d03b32d789c8fcd3e0811c6d50328e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB8 5420 bytes
font_01_sfnt_off00007224.bin
d63e2819787051d2245b1b3978e5c1ee1ca3a47930615929fba7e9e79376d5e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7224 10056 bytes

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