Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ebb03f08bf30dd…

MALICIOUS

PDF

47.3 KB Created: 2020-08-31 11:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 351bb76d8ed81016fb6e759d8817e42f SHA-1: 2b830c0c0b66ab4d4a3d179967b4f9f35579e7fa SHA-256: 09ebb03f08bf30dd89287b04128204be0be61450b4e89d5fd5fb8d3408922e14
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, which is designed to lead users to malicious content. The document body, while heavily obfuscated, contains references to the redirector URL and other URLs that appear to be part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly indicates 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.ru/wix?keyword=cisco+asa+5506+firepower+configuration+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/refajojalomufagusa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1869/8400/files/joseph_king_of_dreams_full_movie_123movies.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/25578472733.pdf
    • https://cdn.shopify.com/s/files/1/0434/2530/0647/files/bullying_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0436/1352/0029/files/4987987997.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/rixipamakuxarijuzawin.pdf
    • https://static.usrfiles.com/ugd/b8c837_50318c33b814446abd54f92e455cd367.pdf
    • https://static.usrfiles.com/ugd/b8c837_affdca35539d4e3f84b75cf182a391b1.pdf
    • https://static.usrfiles.com/ugd/2ca09c_9246d620c2b14d0b959688a02730fca9.pdf
    • https://static.usrfiles.com/ugd/b8c837_74465752283444388758f57b94ea23c3.pdf
    • https://static.usrfiles.com/ugd/7603ae_41765f79ff7d45af9f237f3cb7b47396.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_0cc9a701cf7848ebaff6e702419c9ef8.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_off00007421.bin
12dbd31cc5d34a1ac6a3b69e34346006af795d0ae52df0317f55a901e1ab6dad
pdf-font-stream PDF embedded font (sfnt) at offset 0x7421 5708 bytes
font_01_sfnt_off000087a5.bin
9aabbc42aade83bdd0ec6e1dd034e68886565ba61cc3c0bb27fe73b0a24d9332
pdf-font-stream PDF embedded font (sfnt) at offset 0x87A5 12980 bytes