Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a3d9f86d1e0c96…

MALICIOUS

PDF

41.7 KB Created: 2020-08-30 05:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90518488185a36ef2c60f81e62167c36 SHA-1: ebe63617563c1ff4f18a83a265b0bb19f996d66b SHA-256: 18a3d9f86d1e0c96f94d1411e86f5647d6a51532fcb092f21fd0f746b7d2b361
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=plexus+plugin+after+effects+free++windows, is flagged as a malicious redirector. The document also features a large number of external PDF links, suggesting an SEO spam or link farm tactic. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence indicate a malicious intent, likely to redirect users to harmful content.

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.cc/wix?keyword=plexus+plugin+after+effects+free++windows
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/df4650_7db6c628603b49b990719eaa5b3aecf9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3659f6c8af5494d98e1f132c61d95db.pdf
    • https://static.usrfiles.com/ugd/7598fa_f8f10e4d7554465a9e5ce3cbab38b4cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fdb069ff4f04dcbb37ab1446f3308e2.pdf
    • https://static.usrfiles.com/ugd/221f3a_eb1537828a7f426aaeb33324a85ba191.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4aa6b03043540a28a1ca0aa45a52158.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_a30cdf3dc27b47daaa2985f79f47315e.pdf
    • https://static.usrfiles.com/ugd/238140_c03835010c8b407f9e25da3dd348da3e.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_73f19bfa2b4f43e1b7db672923e0d655.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_0135c780376a4c2f9f402c312dcb75dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_40cc6f6f8651485995aa7e927b10234e.pdf
    • https://static.usrfiles.com/ugd/f0f215_81860032707b4b559ba24d8bc117bdca.pdf
    • https://static.usrfiles.com/ugd/760101_8b13964630aa4c85834eb314880462a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5ec27176e5d4162ade2ca807066d017.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67b4c963fb44659a47360a24d2ee498.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_off0000643c.bin
bc0810fb5a9f66a16949458b456d399ff7c591e8469eb936819c15ee45ea943f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x643C 5484 bytes
font_01_sfnt_off00007701.bin
57b900fdfc19a8af848f8151946bee438931c864c1f18c2294458d1caff1565a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7701 10336 bytes

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