Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7f06741905ade0…

MALICIOUS

PDF

49.8 KB Created: 2020-09-06 21:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a6fe4abd8f1c624e3d4d80de008ea3c SHA-1: 6337337210955104de5498566c0bf0e216640c8e SHA-256: de7f06741905ade096691a1977b4c3d96398816ebf692093a5caed299770aa7a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of the primary links, https://ttraff.link/wix?keyword=battleship+navy+uniform, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a coordinated effort to direct users to potentially harmful content.

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.link/wix?keyword=battleship+navy+uniform
    • https://static.usrfiles.com/ugd/35dc59_3ae13e907c614549ae4c704762538dc5.pdf
    • https://static.usrfiles.com/ugd/3b47cb_bdebd6e481404652b614d913856895cd.pdf
    • https://static.usrfiles.com/ugd/111c46_847937f99f5e43fa8c0e98cd1ffe86f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5c8f34506774f33b82fd20a14167aad.pdf
    • https://static.usrfiles.com/ugd/e2a635_d4003b4902b849298a8c742b6dbbf085.pdf
    • https://static.usrfiles.com/ugd/4bb894_e2123af352c345a1acfa6954c7f24246.pdf
    • https://static.usrfiles.com/ugd/a4d998_88328cba1c514f70857537cf09927f16.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4472/files/weludirokewijofewam.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/sifebitesixepin.pdf
    • https://cdn.shopify.com/s/files/1/0431/3566/4284/files/sefurixiwajikukoxote.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_off000085fb.bin
93e341af68f3c1552bbbd3102871d457c732a2749b1d6e0c64d4701aaea3b023		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FB 5352 bytes
font_01_sfnt_off00009815.bin
57b2bd6769acd3de1c35a2ba0109f142f4b4f7cd0f50d3e64d6c76a612e247db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9815 10304 bytes

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