Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca3bdc36e43f03e…

MALICIOUS

PDF

47.5 KB Created: 2020-08-30 19:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2fe99c31c20c8d5e8301b6c9e5a40be SHA-1: 7b177d404af42910de7c1fdfba066a3f0522aa47 SHA-256: 0ca3bdc36e43f03e15dae05eb4f896cd1eb1c49a9600d7a228793959abce990a
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL associated with a redirector. The document body, though heavily obfuscated, contains the malicious URL 'https://ttraff.ru/wix?keyword=cambridge+ielts+books', suggesting a lure to download further malicious content or redirect to a phishing site. The presence of numerous other PDF links further indicates a link farm used for SEO poisoning or distributing malicious files.

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.ru/wix?keyword=cambridge+ielts+books
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/07e02c_9b7b96f37f3b48b18c3a14db676b0915.pdf
    • https://static.usrfiles.com/ugd/c33cdb_924bc9c5aa804274848567afbe146ce0.pdf
    • https://static.usrfiles.com/ugd/fd7405_fbc910edbdff4b589a1f56dbcec9af7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5302909a1634697abbcab8b6e512245.pdf
    • https://cdn.shopify.com/s/files/1/0430/2517/0595/files/l_alchimista_paulo_coelho_gratis.pdf
    • https://static.usrfiles.com/ugd/b8c837_82e8055f5a22495692bf1ad55f98445c.pdf
    • https://static.usrfiles.com/ugd/0d002d_2345f36ea3224ad68647eb8edff9e54a.pdf
    • https://static.usrfiles.com/ugd/b8c837_216199422f274026a51ee88479231818.pdf
    • https://static.usrfiles.com/ugd/b8c837_9189c0d0b57d498f90bb808ddc05231a.pdf
    • https://static.usrfiles.com/ugd/7f16bd_e503efd601f845388eb731fea8a924ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8ac8470e0cb42a2a898a88c7b77eccc.pdf
    • https://static.usrfiles.com/ugd/b8c837_571338f8de2840c8824c13cd15b6d5be.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a20.bin
ba24c9329a1cf2971506c1c02de77bccd4b45ed9d0dd45aec754a26d9f3e775b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A20 5056 bytes
font_01_sfnt_off00006b54.bin
1d6f6c3f648d5dadb72f65359c3c1bfc97e08d3820c001f62f0bbbf1528c9146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B54 10048 bytes
font_02_sfnt_off00008df4.bin
764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF4 16144 bytes
font_03_sfnt_off0000a2f5.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2F5 4324 bytes

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