Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de78e949310d851…

MALICIOUS

PDF

42.3 KB Created: 2020-09-01 05:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc32d1d908586c843560d40bb909ee95 SHA-1: d8a6ef4596c3470b219fd75a0c87c0b506a6337e SHA-256: 0de78e949310d8512ef2e5e577eb731bdb91306c1c6ac6becb40da3d246690b9
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one primary link identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'weekly schedule template' to entice users to click the malicious URL. The ML classifier also 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.cc/pify?keyword=weekly+schedule+template+microsoft+word
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/451461_01a63b007ee74ac580d7014e0dbda740.pdf
    • https://static.usrfiles.com/ugd/3aca14_8a0df7e228ea4e5ca460366d025855b3.pdf
    • https://static.usrfiles.com/ugd/ab922d_9d5aa3acddc14539903436349e2d7ce0.pdf
    • https://static.usrfiles.com/ugd/a771bd_3333a883fc4b459c9184bf9f56aaa53a.pdf
    • https://static.usrfiles.com/ugd/b8c837_07840ca1bf734c56adf1ec0a5d14d843.pdf
    • https://static.usrfiles.com/ugd/6cf392_76e9826a9d5349b5b0aaf9d04f3648cd.pdf
    • https://static.usrfiles.com/ugd/ecec20_51fa088f22b240508eb810b61048fce0.pdf
    • https://static.usrfiles.com/ugd/429b25_0672a545fc654a7d946320c333af6946.pdf
    • https://static.usrfiles.com/ugd/c6ac46_ae0a8e51e8fa4b0f927607bfc6a344a9.pdf
    • https://static.usrfiles.com/ugd/857e61_c303cfa6171b45208600582d2518e086.pdf
    • https://static.usrfiles.com/ugd/cc03df_43eab137f365493b92bfa704f3cbb2b1.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_off0000676c.bin
8742274e2c35cefaf760c9e79420a313a43ef70d068ba1ba0f07237736e7d7b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676C 5664 bytes
font_01_sfnt_off00007aa7.bin
fd4219d5a02ecbfe99846956525c28246e16f22ff3ae976c8f6f3aa9ad194343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA7 9980 bytes

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