Malicious PDF — malware analysis report

Static analysis result for SHA-256 679aa8d72bfd20f1…

MALICIOUS

PDF

33.8 KB Created: 2020-08-29 15:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 912bd138ba3a68b0a811825b1b75f474 SHA-1: 8202fe448d2d5324b7dfbf5489289862ebc422d2 SHA-256: 679aa8d72bfd20f1d2e5a08328ffd381d2a9fa0377904ddbbfb023ec37eaa5b1
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector disguised as a search result for 'numberblocks game free'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the redirector is malicious. The document also contains a large number of links to other PDFs, likely for SEO manipulation or to host further malicious content. No scripts were extracted from this sample.

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=numberblocks+game+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/99997967319.pdf
    • https://cdn.shopify.com/s/files/1/0435/0964/5478/files/19540402958.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/telubojuletujaxavusu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0292/0086/files/mikiledemumamunun.pdf
    • https://cdn.shopify.com/s/files/1/0440/7807/1960/files/26545956238.pdf
    • https://static.usrfiles.com/ugd/b8c837_0430c70f4fc94b58b4a252bb469f3863.pdf
    • https://static.usrfiles.com/ugd/b8c837_4adedca71c6249a7bcc29ecf813a5d93.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc4d593d89d3458f8c6ce36337143781.pdf
    • https://static.usrfiles.com/ugd/b8c837_daf473557cde4217b9b9c2eee6f07215.pdf
    • https://static.usrfiles.com/ugd/d55797_712533de393f40efb8d1936317062fe0.pdf
    • https://static.usrfiles.com/ugd/cf14a4_0422a1528ae5466fb97b23a8c8c84821.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b95a43b211c4adeb527859945fa3ca4.pdf
    • https://static.usrfiles.com/ugd/b8c837_6eaa2cb787b24813958636a975cbcb37.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_off000044f6.bin
b745f209374f91b1f2de75bc2f2d643ec302127a271c85ae0c9ea78a18c70261
pdf-font-stream PDF embedded font (sfnt) at offset 0x44F6 5376 bytes
font_01_sfnt_off00005730.bin
089a98fc497906716f0760bf6cc0e8a21855dc048d030130168cae9d82311ad7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5730 10496 bytes