Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba23b3fc5859e7e2…

MALICIOUS

PDF

59.3 KB Created: 2020-08-30 08:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecd143b02488a4d9d62f00c6142965b9 SHA-1: 90fb1190ed8069d85cb5e2571fa12c1d8cda6b5e SHA-256: ba23b3fc5859e7e2df97e931a94c6170f271f7439ae48899594b24db53755945
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users into clicking through to further malicious content. The PDF also contains a mass external link farm, suggesting a SEO-based distribution tactic. The ML classifier strongly indicates maliciousness, and the embedded URL heuristic confirms the presence of a link within the document body.

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=history+of+magadha+empire+pdf
    • https://static.usrfiles.com/ugd/191a6d_eb1bf8271bac40dfa3c8f1effa9c0e56.pdf
    • https://static.usrfiles.com/ugd/173616_6c53bd86661d4bb3a96820af0d5bdc67.pdf
    • https://static.usrfiles.com/ugd/b8c837_854c2fd46a664c888cd916e048a33000.pdf
    • https://static.usrfiles.com/ugd/b8c837_c666291a9bb14870a80a1aa66ec89d86.pdf
    • https://static.usrfiles.com/ugd/1a89c8_fa86612711fb4585a1825480987f9bb2.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/bamboozlers_diamond_jim_tyler.pdf
    • https://cdn.shopify.com/s/files/1/0437/8433/9613/files/branch_manager_application_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/9072/9377/files/9787593394.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3370/files/pusexakikemoduvovelos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76423385748.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9666/files/zumdahl_chemistry_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/4272/6310/files/best_antivirus_for_android_samsung_galaxy_s8.pdf
    • https://cdn.shopify.com/s/files/1/0433/7529/6677/files/87541150426.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_off0000a045.bin
f9cf6b432ee8a0f61ec82b8d04026eeb146bfbd5299470e94e1cbf36013d12d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA045 5488 bytes
font_01_sfnt_off0000b2c8.bin
f333dc62aa2216c455e6fdd51a636d305fde12d89bcca2010ecb31e9afc51575
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C8 14804 bytes