Malicious PDF — malware analysis report

Static analysis result for SHA-256 090b593a96b97ee1…

MALICIOUS

PDF

44.5 KB Created: 2020-09-01 21:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4595ff5dafac4eb5283b8194214d249d SHA-1: 9e1cb6a3a1515eb05be391cd9831c5710892a826 SHA-256: 090b593a96b97ee1f29744308a3b005b0df289b890ac911aa27c80de9f149ab0
154 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, with one identified as a malicious redirector. The presence of a link farm suggests an attempt to distribute traffic or host malicious content across multiple sites. While no scripts were directly extracted, the nature of the embedded links and the ML classifier's high confidence indicate a malicious intent, likely related to phishing or malware distribution.

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=ceqa+guidelines+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/7ff653_d8f49fc5053d430ca2d6772e5ab6ae8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_304c82db875343c7814cc21b1dfc30bc.pdf
    • https://static.usrfiles.com/ugd/353d00_d7b17d2a26264e5090a18696feb6449a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fc549d0f0334faeb1aebdd45eb418b5.pdf
    • https://static.usrfiles.com/ugd/6924eb_3c77e4de7ada413496f10788e37396ee.pdf
    • https://static.usrfiles.com/ugd/003b86_1f3604d69b334c8dbd840c9a11c01caa.pdf
    • https://static.usrfiles.com/ugd/086daf_d80e1def629a4c8d82650af309ed6302.pdf
    • https://static.usrfiles.com/ugd/b8c837_24f7d0fef4b5417e9c7205c9f62d74ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_01691dad6cbc42808a6100412fca9911.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5ee22d5d4194382b5ba869f65d86ee1.pdf
    • https://static.usrfiles.com/ugd/d78803_a13df4af31944a8a9df34ede6a21b9e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9c578f1fca946be8a8148f259330973.pdf
    • https://static.usrfiles.com/ugd/3e5d97_a088a093118f402b97c99890bae7644d.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_off00006f12.bin
550a9f341d3d63abe91899dfe42a99426ecf4e7b1501b74c12467bd99bcc0dc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F12 5408 bytes
font_01_sfnt_off00008180.bin
c802358953f4569b8dcfc54516337086b71e5984990845ca0fa52ec620fe7014
pdf-font-stream PDF embedded font (sfnt) at offset 0x8180 10492 bytes