Malicious PDF — malware analysis report

Static analysis result for SHA-256 8470bb34c3d0c072…

MALICIOUS

PDF

39.3 KB Created: 2020-09-01 10:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b79faf30bbf9b1ac4360e503a0d51504 SHA-1: 3a7574bddfc5806f7aba12010049c8f89c01afc1 SHA-256: 8470bb34c3d0c072964ad3fb50079b941033df1bf29bc424366bd76ef970009b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=business+event+invitation+templates
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f55bec_3c931b3435b44e67a7b720776b091556.pdf
    • https://static.usrfiles.com/ugd/e4ff69_bc833de862244ea89a2d65788d25e45a.pdf
    • https://static.usrfiles.com/ugd/b8c837_50302e195d97412e80bf43dd01a2dd3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_597443141cdd4dd08befe21a0b7ad014.pdf
    • https://static.usrfiles.com/ugd/b8c837_90f3194e6bc64949924889cee6bf18be.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8988/files/nordictrack_ctx_910.pdf
    • https://static.usrfiles.com/ugd/01e791_ccbb1d1654724a94addc8190cc167c3b.pdf
    • https://static.usrfiles.com/ugd/07625c_01324947300a4cc8a21cb9103ffdd844.pdf
    • https://static.usrfiles.com/ugd/930050_82b9934ebae142479904217aa2e5a706.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e21ccbca95d4bb39aa29dc03c6e41eb.pdf
    • https://static.usrfiles.com/ugd/1ee69b_28cba6eae40949278b54afd521a2e30a.pdf
    • https://static.usrfiles.com/ugd/c836c3_b03fb66872704f379ad6c1e9935549de.pdf
    • https://static.usrfiles.com/ugd/934fc3_b1a9b68cb5044bc89358f904f6efa788.pdf
    • https://static.usrfiles.com/ugd/55cc32_81307e75948946c2a9f264596358dadd.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd53d685ab4c456e8893d75847023d15.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d91.bin
e3911929d193d968e6bd18faa072762399a39fc5527e2d26bd7d45c83f3e6090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D91 4980 bytes
font_01_sfnt_off00006e77.bin
55c2dbe4c8b4d129fcc142e047f08534b6b106b3256c773429f7b27c8633e6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E77 9988 bytes

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