Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46e4feb18db30c5…

MALICIOUS

PDF

66.6 KB Created: 2020-09-13 17:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20d57390f1f25a024ed01561d4e832b2 SHA-1: 95e3dab8bd548d803f5d8ede95ea35edd61c3a4c SHA-256: d46e4feb18db30c55c5648db86d022b3d46099436dcb0421fef699fe2c4abed8
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, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=chemistry+chemical+quantities+worksheet', likely leads to a phishing or malware distribution site. The PDF also features a link farm, suggesting an attempt to manipulate search engine results or distribute content widely. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.link/wix?keyword=chemistry+chemical+quantities+worksheet
    • http://dajef.sammijofitness.com/uploads/1/3/1/6/131607131/29fdc.pdf
    • https://static.usrfiles.com/ugd/ef7486_883f77cbfe934a6b8478ac3672fe2465.pdf
    • https://static.usrfiles.com/ugd/5b5da7_b8752fe7a86740ba90761bc4bdc8f8f7.pdf
    • https://static.usrfiles.com/ugd/7a359d_4d274f58ce9f476c944e2579dbb6bc52.pdf
    • https://static.usrfiles.com/ugd/48bf55_d3a0960300454129bed13c4c5120e17b.pdf
    • https://static.usrfiles.com/ugd/963627_a648e93d3d9742a49309f21fd3c57aca.pdf
    • https://static.usrfiles.com/ugd/b916f4_898f0f50d2934ccead7dcb5568107fa3.pdf
    • https://static.usrfiles.com/ugd/16879a_72e92673b8ab44a0978eb29854cbea2a.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_8eb8130e67174f21b72dfd7dcdad8302.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_off0000c664.bin
d04089e7d814fe5017af166492635537a0b053a4b044599f97b0be3c41dac8e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC664 5328 bytes
font_01_sfnt_off0000d86c.bin
d0961ec3615f5ad864eb0484e7113404ef7e436f318eafda84ab9fda07b77fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 11196 bytes

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