Malicious PDF — malware analysis report

Static analysis result for SHA-256 7915b757c2e98fda…

MALICIOUS

PDF

38.9 KB Created: 2020-09-08 16:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95bde1f52d80af370b31692a44c0e66a SHA-1: 620801667a0270fbdfff0d5992bf1fa8ff539f89 SHA-256: 7915b757c2e98fda83db0f515f1bc016f81815926219bdd88aa8649afe20d3f0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links and text promoting a 'KMS activator for Windows 10 offline'. One of the primary links directs to 'ttraff.club', which is flagged as a malicious redirector. The document also includes a large number of links to PDFs hosted on 'usrfiles.com', suggesting a link farm or SEO manipulation tactic. The presence of a password-protected archive lure heuristic indicates the document is likely a dropper for further malicious content.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.club/wix?keyword=kms+activator+windows+10+offline
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/1fbf8b_f560b02611134020b93ef8766b45f210.pdf
    • https://static.usrfiles.com/ugd/1b7c00_3853ccbb10a34a03b4ddf8c140b40d0c.pdf
    • https://static.usrfiles.com/ugd/e66789_0aecb1a2a06345848cfadd2b6e082658.pdf
    • https://static.usrfiles.com/ugd/35f767_ca49e1113bf64c44917e8bdb9d87694b.pdf
    • https://static.usrfiles.com/ugd/7a359d_1f7797d1ee9841968bf9c9ac9f53643a.pdf
    • https://static.usrfiles.com/ugd/d2057d_1c7cc1991e3f44f999727653cb00f331.pdf
    • https://static.usrfiles.com/ugd/d775a9_74c58562772147a4bd74e517201a5bd0.pdf
    • https://static.usrfiles.com/ugd/f1d680_4bbc778cea2b4c9f8d9a698b06e87c66.pdf
    • https://static.usrfiles.com/ugd/b8c837_4235b089907c41ecaac2a0bdf77f4a4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecde8617b58f4ec8acc2359192e4fa6e.pdf
    • https://static.usrfiles.com/ugd/21e6f2_1c398bd27a314da1ab048b924eb22e2f.pdf
    • https://static.usrfiles.com/ugd/ca300b_091c0f19d3274b2d94005050f0fe31f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0b9f2e80a844d1cba436aabd9056d62.pdf
    • https://static.usrfiles.com/ugd/e2b09b_b3174bed17444d33ba40f956825a3328.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_off00005966.bin
22c37cc6b235f495c92181192269fd240f14a4e61869918882689a54bd7a0290		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5966 5484 bytes
font_01_sfnt_off00006c12.bin
f1362a3d225361762f31dd5680a82d714073264949eda289f9233a489b9df361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C12 10264 bytes

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