Malicious PDF — malware analysis report

Static analysis result for SHA-256 e874d9741450428c…

MALICIOUS

PDF

78.8 KB Created: 2020-09-08 04:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f46fdfc2b5d43c7d2c40bb350599cb58 SHA-1: a57f0059d55e552a6c269418f6075e004422f6b3 SHA-256: e874d9741450428cb8fd857fc8081a425e7edd6c4e312414c96e8de04b463441
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness. The file was generated by wkhtmltopdf, a tool often abused for creating malicious documents.

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.com/wix?keyword=cooling+tower+working+principle+pdf
    • https://static.usrfiles.com/ugd/cece23_aa602236822f4e0bb1ff94fc9659b6cc.pdf
    • https://static.usrfiles.com/ugd/957c7b_679f2701e28648ce981b3ba5f8b54e80.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0cbe733d7d940e59e53921b7a18ba7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a51bde549a4b435ea3aabcaf1a2a355d.pdf
    • https://static.usrfiles.com/ugd/0d002d_336bbf96535a4b2c8bd0d1622dd431d3.pdf
    • https://static.usrfiles.com/ugd/9dda13_937310f0291146539d1ef98a9ac23ad3.pdf
    • https://static.usrfiles.com/ugd/e2b09b_d05dcd61ffda44d9b34c8cbfd42c8ea0.pdf
    • https://static.usrfiles.com/ugd/ccb1c6_27a80b29d2ba4d62a7674c6670431d43.pdf
    • https://static.usrfiles.com/ugd/b50c55_292a928f80234aabbb0d3509e78779b1.pdf
    • https://static.usrfiles.com/ugd/a771bd_2ed76e9dc936403284a3a8f99a8db22a.pdf
    • https://static.usrfiles.com/ugd/6df952_9b758718a3834a9baf29bce2c3dbecb5.pdf
    • https://static.usrfiles.com/ugd/1cfe37_f92e1e69e60f43bead6765a0ce287482.pdf
    • https://static.usrfiles.com/ugd/6fd45c_995196e6dc9c44b49421d8caa2c1079c.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_cd568f802bd94072a20c5933275922f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_8df052a8eff54f639f43a71e5b786c04.pdf
    • https://static.usrfiles.com/ugd/0d9a50_ebbac1922d5e4818bcdead03e8c6feb1.pdf
    • https://static.usrfiles.com/ugd/09273f_3c6134820cd34051bc5a383930540e8b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e395.bin
909cb25149bb5585bc6a2999defd9de9588296ca84b3fcabcebcd76790df10c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 4996 bytes
font_01_sfnt_off0000f4bd.bin
553f84d3077bc0b3c7e315dc27854520a2b2355cef81c253553dddd47ece9d4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 10504 bytes
font_02_sfnt_off000118f0.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 16060 bytes

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