Malicious PDF — malware analysis report

Static analysis result for SHA-256 5951f1cb372736aa…

MALICIOUS

PDF

40.9 KB Created: 2020-08-29 20:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34749802ca524cca8216dea956c80769 SHA-1: e392f0c26cb9c580581216a7c9cd0ffcaf38a16e SHA-256: 5951f1cb372736aade4c28de35ca3150f68f034f3e4bb645ac9a5b54eabb6802
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel users to a malicious destination.

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=link%2527+s+awakening+seashell+locations
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/86110039631.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/35083555257.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/zubojibe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9037/8909/files/44959863340.pdf
    • https://cdn.shopify.com/s/files/1/0432/8367/7339/files/zapirobunusexik.pdf
    • https://static.usrfiles.com/ugd/b8c837_acc9996442cf4f24886946e74f2cdc9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8948c536692046169f916229fb10dbdd.pdf
    • https://static.usrfiles.com/ugd/a58b01_4999ecf560a547209c9e1f327001e206.pdf
    • https://static.usrfiles.com/ugd/b8c837_6dc7f39e312144e18ce24ed2f66e7f4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e53aff4846cd4ff38480f7f89c86b1dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_114f6fa836b74e938d7a4e247ad61e08.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba93b535eeeb4a2d9bc6324b2a4f0474.pdf
    • https://cdn.shopify.com/s/files/1/0432/5464/4894/files/46745775041.pdf
    • https://cdn.shopify.com/s/files/1/0434/1723/9704/files/bash_rename_directory.pdf
    • https://cdn.shopify.com/s/files/1/0464/6171/4584/files/behind_enemy_lines_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/ella_fitzgerald_summertime_sheet_music.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_off000063cf.bin
bd7d13963fe964098c6e146109b5ca18024755b6bd5ce91bb7d8e142e607b02f
pdf-font-stream PDF embedded font (sfnt) at offset 0x63CF 5096 bytes
font_01_sfnt_off0000753c.bin
8f3ec7afc7987acb110e33be2fe6ae13b9e62b92d9b52d71588671f4e15e2f47
pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 9784 bytes