Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e228440d2b151a…

MALICIOUS

PDF

48.9 KB Created: 2020-08-29 22:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e2fd1715b54901e96d237ec9da361e5 SHA-1: d80e56a07585ea2b660d4c2a5f43503d5224c0b3 SHA-256: 81e228440d2b151af62ac0a6c5d706e761941a6020b1e8b172eb8a939f69a770
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document also exhibits characteristics of a PDF link farm, with numerous links to external PDFs, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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=apprendre+l%2527+anglais+pour+les+nuls
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_cfa4bfd4d8014aec97212927136faeb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_779f679d34cc4bf49bc449e7b4a11641.pdf
    • https://static.usrfiles.com/ugd/b8c837_438e1362bc0744e18a14f7939ea4c637.pdf
    • https://static.usrfiles.com/ugd/b8c837_07bfda3f47ad47bc857ddf167f47618f.pdf
    • https://static.usrfiles.com/ugd/d775a9_fe105ebd243741539b8d856702675362.pdf
    • https://static.usrfiles.com/ugd/b8c837_efec9eb68e56477fb6a6a8eed6735244.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_9ccd720bd03a466888d15fadbebb549e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2bb1a4cef80c490d9b7138e7d24b7a8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbbe5d7c3b594555a9671ce984d57710.pdf
    • https://static.usrfiles.com/ugd/8ab72e_6586171a0e2749f5a7079dd39cbbde0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c6cbe1d631246d2b27c5c00f0925dff.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bead4e9c68543a59eed809cbc10e605.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006da4.bin
358a8d22514a7839ada126b0bd556d9e269168a961de59ab98ed3e8b4f2c4fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA4 4952 bytes
font_01_sfnt_off00007e79.bin
61917dd420281dd1db54bf0c78a21f5fe86d6493ebc7859ba1ae90291930969a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E79 12944 bytes
font_02_sfnt_off0000a6d3.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D3 4324 bytes

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