Malicious PDF — malware analysis report

Static analysis result for SHA-256 258ba008bceec925…

MALICIOUS

PDF

42.6 KB Created: 2020-09-08 22:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ff8df5bad34bee1a216bc1df925c3ba SHA-1: c5aee7eccd771caa58d9d94151bf0377753e186a SHA-256: 258ba008bceec925c96a250f413c4d0aefb053c6ea5e5b4494a829f6c836c32a
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, 'https://ttraff.me/wix?keyword=cbse+net+form+apply+online', which is flagged as malicious. The document body, though heavily obfuscated, contains this URL and appears to be a lure for 'cbse net form apply online'. The PDF also contains a large number of links to external PDFs, suggesting a link farm or redirection strategy. The ML classifier strongly indicated maliciousness.

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=cbse+net+form+apply+online
    • https://static.usrfiles.com/ugd/6cf0f5_57a01ed59d9c43d5964814407547bdba.pdf
    • https://static.usrfiles.com/ugd/9904c2_51e792b4e8574915a24c2cf31556b44d.pdf
    • https://static.usrfiles.com/ugd/a76634_d9071c01041e4d0f8ac7dc44edb8acfe.pdf
    • https://static.usrfiles.com/ugd/197ed4_5444fc53890e44709ca6ffed74ec7f4d.pdf
    • https://static.usrfiles.com/ugd/d5cf39_822fc242c66b480a80e0d36308bec77e.pdf
    • https://static.usrfiles.com/ugd/16879a_b9068eae7ed14d2b930897531c3b0608.pdf
    • https://static.usrfiles.com/ugd/4d548e_a7c60d6f41ec4954aa85fb1c58e36722.pdf
    • https://static.usrfiles.com/ugd/b910ae_b3121d4132e94530a06592f5751df354.pdf
    • https://static.usrfiles.com/ugd/82e28d_d7caf51e00a245ab86f9c1039ab57936.pdf
    • https://static.usrfiles.com/ugd/aef5b7_52d35f4af0444cd7a852621a12f6c54b.pdf
    • https://static.usrfiles.com/ugd/136d07_996f4282d2d44883a5e8a03e0a44fd24.pdf
    • https://static.usrfiles.com/ugd/61f964_75183116f67c46d98b7c073162b77346.pdf
    • https://static.usrfiles.com/ugd/948cea_bd852332716149c58e94caf3beac9562.pdf
    • https://static.usrfiles.com/ugd/d9f7b5_34c8fc343fcd42fa8f95e0c300717299.pdf
    • https://static.usrfiles.com/ugd/696b8a_66a0c129c1f14e289f0afd3342dbb6d3.pdf
    • https://static.usrfiles.com/ugd/2ca09c_1d46f28af6344d6fbd7381965a4a86e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d97d5e29f75348068df25c3151cc880e.pdf
    • https://static.usrfiles.com/ugd/40336e_26825bd94d6b4335ba36911996bd3f56.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_off00006859.bin
49a5b75a2283d137daed33d11d2c59db41af3a717a6e2a6a98f0f6553fdfb11c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6859 5196 bytes
font_01_sfnt_off000079eb.bin
09e6bbc2aacd16a8e721dc938227796339deae799e9576d46f13e1732568b087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EB 10480 bytes

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