Malicious PDF — malware analysis report

Static analysis result for SHA-256 8565a4bc91ca4651…

MALICIOUS

PDF

48.3 KB Created: 2020-08-29 15:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db85729e761b47b93752fe85502a583c SHA-1: a0b5f40acf594f9b90325ad7ade0831bcb675b0d SHA-256: 8565a4bc91ca4651e067bb63b6522fc45de4c7057428bac12cafa756787893a3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary one leading to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. The embedded URL in the document body, 'https://ttraff.ru/wix?keyword=ejemplos+de+abstract+en+un+ensayo', is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site.

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=ejemplos+de+abstract+en+un+ensayo
    • https://cdn.shopify.com/s/files/1/0430/6773/6225/files/cuplock_system_scaffolding_manual.pdf
    • https://cdn.shopify.com/s/files/1/0463/4909/0978/files/clozapine_missed_dose_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2645/files/repolexukavunotokoworoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/24563429915.pdf
    • https://static.usrfiles.com/ugd/b8c837_61aead6d60824e048b7a574f62f2de6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4cbe7e7323444aea7e66e11fc4146a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c7f3d3e466548b7970e64e2a7a087cf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/60893086392.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6657/files/28965480413.pdf
    • https://cdn.shopify.com/s/files/1/0432/8148/1884/files/72655692917.pdf
    • https://cdn.shopify.com/s/files/1/0439/1115/1768/files/87621606570.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_off00007be0.bin
9f2f73949e7446e5fcd94e79e6813562cc1fa3aed8cc5f0af1f7f107c5854883
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE0 5492 bytes
font_01_sfnt_off00008e7e.bin
616a698a7a0c921fbbf3693fd5446defe81f22a0a0b5ecfee58d54ce54b8b27f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7E 11876 bytes