Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dac067e542762c6…

MALICIOUS

PDF

55.0 KB Created: 2020-09-07 11:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62075cf248949b088b5e1df92f785c9f SHA-1: 6797f90cb11b1ee4cdad8a20a2152842e3ca8726 SHA-256: 6dac067e542762c6c2aa35a6186dd4dbb678393b5582f95fef9a3d9761bed0b3
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 infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs. This suggests a phishing or malware distribution attempt where the user is tricked into clicking a link that leads to malicious 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.link/wix?keyword=adjectives+worksheets+for+grade+6+cbse
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f99735_aabcd2e0dfc54ae29e98232f6db591a5.pdf
    • https://static.usrfiles.com/ugd/de9003_94518a2cbe61421a89e1f13d3cac72e9.pdf
    • https://static.usrfiles.com/ugd/ddb60a_08b92923012b41b7b80ebcfb690f1187.pdf
    • https://static.usrfiles.com/ugd/338562_5f8f4e00e31540b2bae06aeea700cbf9.pdf
    • https://static.usrfiles.com/ugd/5f226b_daa78775479441cf80c291396559b5fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a0d2140dc5c485c8c0658163308a9da.pdf
    • https://static.usrfiles.com/ugd/cc207a_45a23f30a7ff41ea8270fd6b0b11e3fc.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_fc05ea0832b240189229e8c4f8567a96.pdf
    • https://static.usrfiles.com/ugd/73c254_0c3f808ee4804dc496f0c4d25affece5.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_42cdad178a344256b837778f8085b42d.pdf
    • https://static.usrfiles.com/ugd/2ddd39_ff7dc1e5c7484b15b179ad16852d6288.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cd3d2001f3f4b24a3b17dcfecd18bb8.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_b519766303874f0e86a21c12818d4fb8.pdf
    • https://static.usrfiles.com/ugd/5899d5_7e6acb1e8cef474cacb35d76c1ccf130.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_off00007a9e.bin
cb97c4b51ac1c264c2ccf5804ef364d41b7484177c782ce17cdcb99fea4fbc71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9E 5828 bytes
font_01_sfnt_off00008e8d.bin
39c936aff3bcf6ae37c783c966e9bd039478face07fee06538d9ccb83c68f468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8D 13592 bytes
font_02_sfnt_off0000b94a.bin
c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB94A 16144 bytes

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