Malicious PDF — malware analysis report

Static analysis result for SHA-256 12aaba85bfcc57a5…

MALICIOUS

PDF

51.7 KB Created: 2020-08-28 21:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7934662fc9f8544743b2226bd25cf90e SHA-1: acc96e8630ffdcba2afb0032c411ff1768fb245f SHA-256: 12aaba85bfcc57a5d95cb19ea3df88ace50b3e7a6a2ca02de6006d85595e6db5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for further exploitation.

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/wix?keyword=r+markdown+example+reports
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d480769a35384017974c1bb12043c8d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e4e2a1d621446939847d2da4ef603dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_f602e6d0c98f4ab48961cb3c154c89d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_35f541860a7a4d03b64aaf45e2b94f5f.pdf
    • https://cdn.shopify.com/s/files/1/0431/9926/6979/files/8580649828.pdf
    • https://cdn.shopify.com/s/files/1/0431/0941/7127/files/sasawakobojebabitojefowe.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bec7bd20ef2441ba72da88219e6da27.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2a1da7199a44c059a1aa85f7bc1cda8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0de796fada64556b4cb00baf59f5ec7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8c1b7c2300c4639b99ccf2f4fdb7625.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cd52917e14841fa9d6d8f502e6b7cb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf6d042501604a5ab710fa21e3333053.pdf
    • https://static.usrfiles.com/ugd/b8c837_77221a66c268461892ee2ec5bfdc527b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c45b466862d24e3e9a3067ae7ffe2457.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075f0.bin
c62150d28b8a0b70094f76f4a66b3bb4f5379741cb97c212949bea6edc426eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F0 5336 bytes
font_01_sfnt_off00008813.bin
3ece1d5d02dec16a4dd519585be259bb2e6a8e61b284902571496beb64102b70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8813 10604 bytes
font_02_sfnt_off0000ac77.bin
df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC77 16060 bytes

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