Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae94a128a68ba27e…

MALICIOUS

PDF

104.6 KB Created: 2020-09-05 20:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6dd39c0a6f649dd636ce81a6ee0bd6d SHA-1: 3333d6ebb01d59e78f5a38cd46ee0d2ef3e691fe SHA-256: ae94a128a68ba27e12e07ad4d5f395f1a6cd7717fb1886aada90703062e34baf
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/wix?keyword=ayyappan+malayalam+songs++tamil+starmusiq, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external content. The presence of numerous external PDF links further supports the link farm heuristic, indicating a potential SEO poisoning or traffic generation scheme.

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.cc/wix?keyword=ayyappan+malayalam+songs++tamil+starmusiq
    • https://static.usrfiles.com/ugd/b8c837_612b827bc8e34a2eb1d2979b865c90c6.pdf
    • https://static.usrfiles.com/ugd/8dde66_2c6868d89d854c238b24fa53c0e6e24d.pdf
    • https://static.usrfiles.com/ugd/8de238_5bea882388094fc080c4dc9a317048ec.pdf
    • https://static.usrfiles.com/ugd/0d9a50_d9bd076ec07c47b6900228ac0cd8b9ea.pdf
    • https://static.usrfiles.com/ugd/7ff653_37b21d0ebe38412b97dbc173e5dd2b18.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdfa90182a5d4bc28e25f13ed5d7ec77.pdf
    • https://static.usrfiles.com/ugd/35c6e2_5086ecb6cd884e38af9a8ed992ffd1a3.pdf
    • https://static.usrfiles.com/ugd/81d6a4_42facea1be5246478cf5369b6439a277.pdf
    • https://static.usrfiles.com/ugd/d90490_2f77b7d271f143d486e7af9b0842f636.pdf
    • https://static.usrfiles.com/ugd/f6a907_10a1b8f0d1214798b5c0d58bdb8ebdc8.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136e6.bin
30652920ecede1b1a68816b56980474ed4f8882f135c4b069fb46c48ac9d3bb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136E6 5120 bytes
font_01_sfnt_off0001482c.bin
52a95c92a60851d8cc731fca0a53624cc693c0d9d57fc19216afc59bc2de8506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1482C 4940 bytes
font_02_sfnt_off00015908.bin
4e2814a3e4a9c32966366654624c3e2be64de3ff0d3e6a1677d29ede1b9fe416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15908 14984 bytes
font_03_sfnt_off00018742.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18742 4324 bytes

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