Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aeb598f9ab2c23d…

MALICIOUS

PDF

41.5 KB Created: 2020-08-30 11:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb22ed5cc67a5c6415532bf527d3f8ad SHA-1: 9437b12d22d256fac4d8a2f90a2cac778de2b0c4 SHA-256: 3aeb598f9ab2c23d45e47d0db9361761c80010e1fcbdad71b2bf2f2ee3d19b8f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=value+of+agricultural+commodities+pr'. Additionally, a PDF link farm heuristic indicates the presence of numerous external links. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The ML classifier also strongly flagged this PDF as malicious.

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=value+of+agricultural+commodities+pr
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/california_dreamin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/1072/6815/files/99671016086.pdf
    • https://cdn.shopify.com/s/files/1/0432/0146/2436/files/52362250146.pdf
    • https://static.usrfiles.com/ugd/6cfc61_2dadd3f7d53f4659b3e67c54a8a409e3.pdf
    • https://cdn.shopify.com/s/files/1/0434/4109/4817/files/65353791476.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6564/files/59223676224.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/lafinuminigofilorupe.pdf
    • https://cdn.shopify.com/s/files/1/0437/9472/7074/files/82313809804.pdf
    • https://static.usrfiles.com/ugd/f80014_71b26ff9203d41a1ab99b086bd52447a.pdf
    • https://static.usrfiles.com/ugd/6f58fb_12b3970ef11740b7a346049ad377141c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a50c5eb6719045658286e5b0bcf964b7.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/
    • https://static.usrfiles.com/ugd/b8c837_a50c5eb671904565828

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063cf.bin
d90c36f2f41a2957b4ea5cbe687dd5dbc9bea3f69a34f9505677f1d207f9d230
pdf-font-stream PDF embedded font (sfnt) at offset 0x63CF 5440 bytes
font_01_sfnt_off00007642.bin
e9c2296b3b9e8c31d80875175a5f439462100876b4b864b1348144024aae2a21
pdf-font-stream PDF embedded font (sfnt) at offset 0x7642 10224 bytes