Malicious PDF — malware analysis report

Static analysis result for SHA-256 4233d661da502da1…

MALICIOUS

PDF

52.7 KB Created: 2020-08-30 21:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1f1a9ad551ea58c3b17c2187b11ba1 SHA-1: 5b0f1710ae43e91bbd38120ff7c7609f5d91620f SHA-256: 4233d661da502da134491ef228dd53cf59c905a1a0edf34a8df8207ffa05ca83
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs. One prominent URL, 'https://ttraff.club/wix?keyword=yuval+noah+harari+sapiens+a+brief+history+of+humankind+summary', is flagged as a malicious redirector. The presence of a large number of links, many pointing to the same domain, suggests an attempt to manipulate search engine results or distribute malicious content through a network of seemingly benign documents.

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.club/wix?keyword=yuval+noah+harari+sapiens+a+brief+history+of+humankind+summary
    • https://static.usrfiles.com/ugd/2ca09c_fc1a83a2addc42a5856487ecf824bbc8.pdf
    • https://static.usrfiles.com/ugd/f14cf6_44c3cd1cad8042fda91ee98cebbc7932.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_24e46cffb0a947b2bcbe6b437b249468.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1cf448b6cbc46a68b31134152d4f845.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/29626550036.pdf
    • https://cdn.shopify.com/s/files/1/0433/9702/1854/files/secretary_short_story.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/microsoft_office_2016_mac_crack.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/magaxopitatajilonigifapok.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/wasonemorogani.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_00d4f4795f7c46e3bcee3635934f789d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fb875fa3d1c47099af43c8358cca095.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b975aed840f46c6a6f75c187cd3bbef.pdf
    • https://static.usrfiles.com/ugd/b8c837_35abd24c862d4319b7e29aed266c0f7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0fd2484c14884def85a5fb0ec61fbfc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd6e12968b1e492685f902502269d625.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a76.bin
ba2c71a13eca487893a74939e9c018eadd59908a2ed28e45a9e87d09957eb497
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A76 5608 bytes
font_01_sfnt_off00009d64.bin
095b0eb7b71373b3497bdb64960e5c62959346544e852acf6ccb0131b869ddd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D64 11656 bytes