Malicious PDF — malware analysis report

Static analysis result for SHA-256 606087dbdbd2ba99…

MALICIOUS

PDF

41.7 KB Created: 2020-08-30 00:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25e841b43ef421ad1dfdec593c374aa8 SHA-1: 7318e3a5350c048ff27f25831d87041556b98aef SHA-256: 606087dbdbd2ba99ff50f5c95a7fc208ac3797dc306ee168e58a6504e146ecb7
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'origami tessellations templates' and a URL that aligns with the malicious redirector. The PDF_SEO_LINK_FARM heuristic also indicates a large number of outbound links, suggesting a link farm or redirection scheme.

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.me/wix?keyword=origami+tessellations+templates
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0df15e_e8e9b80735aa43aa9666647667a436e3.pdf
    • https://static.usrfiles.com/ugd/1cfe37_f1f0d3c1f0e94cca8bdbb2ff855ce4b0.pdf
    • https://static.usrfiles.com/ugd/22739b_251305e2a6f9474d8d2bc21046c42c9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_70e854ce6a3d4db89aedaaf136a267a3.pdf
    • https://static.usrfiles.com/ugd/5360f8_9f25bf8044b94742b4d4e36707865841.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b1a633001ce4af7bdc2582769e90779.pdf
    • https://static.usrfiles.com/ugd/b5472a_1e7e15e66e824eccbb8b504e16648737.pdf
    • https://static.usrfiles.com/ugd/e5a943_a5a30cfc7627407b8fef1466bce046a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_754389c3fe49474483e0c5960eceea09.pdf
    • https://static.usrfiles.com/ugd/b8c837_c97d650ad7d44f28b86e8513a051f3d3.pdf
    • https://static.usrfiles.com/ugd/3f80ec_917aa8896b514d2a919cd2fa7e0c01df.pdf
    • https://static.usrfiles.com/ugd/b8c837_17843f1b74f547aab2b79d085ca6893f.pdf
    • https://static.usrfiles.com/ugd/b8c837_74942d65a4a642b8b780e8b884f61fd6.pdf
    • https://static.usrfiles.com/ugd/7f46b5_eb3825fc53e04c9c9f5446381949f31f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d87e6d813ea4411828a438f86427d85.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1cf448b6cbc46a68b31134152d4f845.pdf
    • https://static.usrfiles.com/ugd/e73fea_f882e62607024ae7a70b837f1634bc8a.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_off000065d1.bin
340cd614283eb170b0dabb87efcd1b9a6dcdad75ceef7e89b3afdfaa0838c122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D1 5164 bytes
font_01_sfnt_off00007749.bin
6fe590383fa2d31b5339940315ee02383346210e1c04255002d0cee04fef6eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7749 10100 bytes

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