Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d788728781d6ca…

MALICIOUS

PDF

43.1 KB Created: 2020-09-02 14:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f3db9c2756ae0352eae7beb5eecfac0 SHA-1: c9df68308de2c3aceb59a9161438f8879192a7dd SHA-256: 64d788728781d6cae69121a008b52d8aaf76b65751fac02703d7c282b7dabc44
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful destination. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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/pify?keyword=check+apple+watch+battery+performance
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_13281f00f0d746fb824f14a438d82bfa.pdf
    • https://static.usrfiles.com/ugd/b8c837_612b827bc8e34a2eb1d2979b865c90c6.pdf
    • https://static.usrfiles.com/ugd/4ae4db_99956533bbc649469a5958108c9716d9.pdf
    • https://static.usrfiles.com/ugd/8b97dd_3ab0a07b3b0341799f8238938a7be1b5.pdf
    • https://cdn.shopify.com/s/files/1/0428/7630/5564/files/fugelosabevexaze.pdf
    • https://cdn.shopify.com/s/files/1/0431/9218/9089/files/72837813629.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/basalt_fibre_reinforced_concrete.pdf
    • https://cdn.shopify.com/s/files/1/0433/7690/2309/files/bagpipes_sounds_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c43.bin
7545b12325c9a7ed7524fdfa53951aa1c87a3a5c43927f2116d5c4e657806d6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C43 5236 bytes
font_01_sfnt_off00006e05.bin
d5c140febb6578413d9aa4d48d765ca6f7fe35068881e39530873ebbc6408dda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E05 10580 bytes
font_02_sfnt_off00009238.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9238 4324 bytes

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