Malicious PDF — malware analysis report

Static analysis result for SHA-256 7484eac5b229658f…

MALICIOUS

PDF

39.9 KB Created: 2020-08-22 17:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f2c44500df88f46fcb25d1763de3343 SHA-1: fa8fffe3538b001e51c40590275e07608145f61d SHA-256: 7484eac5b229658f51c5252eb68df772b276523e254ba48546197d73de43c219
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The document body, though heavily obfuscated, contains references to installation guides and URLs, suggesting a lure to trick users into clicking malicious links. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=fortinac+vm+install+guide
    • http://files.digitalcaricatureartists.com/uploads/1/3/1/4/131452958/7898806.pdf
    • http://files.kulmnd.com/uploads/1/3/0/9/130968985/41a211de.pdf
    • http://rofesug.centelmedia.com/uploads/1/3/0/8/130814011/duzoxixaludat.pdf
    • http://lazoroxu.751sttankbattalion.com/uploads/1/3/2/7/132710621/58ceb921b525e.pdf
    • http://files.tiloscleanwater.com/uploads/1/3/0/9/130969182/8163648.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/7804/5086/files/ninazonibukivule.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6003/files/rexavel.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/16385176824.pdf
    • https://cdn.shopify.com/s/files/1/0434/3896/4903/files/52336901905.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/sexirasem.pdf
    • https://cdn.shopify.com/s/files/1/0439/2206/3515/files/fozegekeluzeweketite.pdf
    • https://cdn.shopify.com/s/files/1/0438/9021/3019/files/blob_file_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/6675/2164/files/kufebefotetodiguseluriri.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/a_b_simpson_books.pdf
    • https://cdn.shopify.com/s/files/1/0436/7994/0761/files/95651466554.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/34501238836.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/3951519715.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/xedebatufana.pdf
    • http://mozilla.org
    • 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_off00005e3d.bin
ddf162984bbfdb88dc1ccd237d61909d754badedaf73108874076cc5947762d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3D 5272 bytes
font_01_sfnt_off00007015.bin
deb2be760212b170698eb16b40ce0ffc94cf85cec431846afa3d8c0e1601e881		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7015 10012 bytes

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