Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff0ac9a66648e74…

MALICIOUS

PDF

37.9 KB Created: 2020-09-01 03:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3897b0266d454ac68e16afc17c496b7 SHA-1: b651f1ba3550e570698c553ad2e2a962e31b20bc SHA-256: cff0ac9a66648e7478a5fac70e6c105ef7dd6d00651d4cf082f501318ca8650a
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains the primary malicious URL. The ML classifier strongly supports the malicious verdict.

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.cc/wix?keyword=herbivore+carnivore+omnivore+worksheet
    • https://static.usrfiles.com/ugd/f46427_2b5885d2721e4d9c9867cc8bf88d51af.pdf
    • https://static.usrfiles.com/ugd/b914b5_75ae28b8b0bc45bb9e8b1139dcdcef80.pdf
    • https://static.usrfiles.com/ugd/5b604d_09b5e9a493554dee9d607aaeaf2d2ffa.pdf
    • https://static.usrfiles.com/ugd/9219f8_c74b9e98bc764a6195ef2ff2804e6b42.pdf
    • https://static.usrfiles.com/ugd/a18aa6_bc2ac2bcd6c84fba91ee807c8c10f423.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/95148274688.pdf
    • https://cdn.shopify.com/s/files/1/0437/7087/1970/files/astro_file_manager.pdf
    • https://static.usrfiles.com/ugd/b8c837_01e28d8f763345b69d8f06f44f098b44.pdf
    • https://static.usrfiles.com/ugd/fdee49_5965abb1cdc842da83829d0a23bba24e.pdf
    • https://static.usrfiles.com/ugd/3e9e83_4ee8b7b0ab4d4198b299696227a0328e.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_off00005628.bin
3ee424014927977ee7b4c79186e9bca97460d7d4ad61aab4c0abbea6c2c041ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5628 5324 bytes
font_01_sfnt_off0000682e.bin
b52e739fb8f219aca7366faa53c960c0f53e29e0d3c4d775633a99b580563276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682E 10272 bytes

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