Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dee322ff1610ff…

MALICIOUS

PDF

52.1 KB Created: 2020-08-30 20:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9c149b243d53850423d135fed44cf23 SHA-1: c3ee8b769628a2f66b919e15edaec609af3ddcb0 SHA-256: a4dee322ff1610ff7f0dfa8f211667580cb18977f0846ff2798d0e8e5aaa4ec9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=ac+dc+rock+roll+train+bass+tab'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which point to 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily garbled, contains the same malicious URL and several benign URLs from static.usrfiles.com, suggesting an attempt to disguise malicious intent with a large number of seemingly legitimate links.

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.cc/wix?keyword=ac+dc+rock+roll+train+bass+tab
    • https://static.usrfiles.com/ugd/b8c837_eceaa00d0e2d4ebd8888d8e36a723509.pdf
    • https://static.usrfiles.com/ugd/b8c837_1154e8dfc2314780b91c9176189f6f26.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b45f645a8f446e1a05ee991c4a83db5.pdf
    • https://static.usrfiles.com/ugd/fe83c3_d32a5dab303545978073f207b0ac8878.pdf
    • https://static.usrfiles.com/ugd/b47706_65160d089a9649c08ec2f3c0cfdc4281.pdf
    • https://static.usrfiles.com/ugd/913720_4f41ad5f6e7845ecb3d455eea1ec58e7.pdf
    • https://static.usrfiles.com/ugd/49be48_f28f018f47ab477a81f7ce0588a19cd6.pdf
    • https://static.usrfiles.com/ugd/b8c837_080dccfeb0af425a81cff814dfa737ab.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/wpf_binding_string_format_timespan.pdf
    • https://cdn.shopify.com/s/files/1/0437/2591/4277/files/pdf_to_word_converter_offline_free_download_for_windows_8.pdf
    • https://static.usrfiles.com/ugd/289c5e_5bccf291cc2141d5bb17850a04d03be5.pdf
    • https://static.usrfiles.com/ugd/ce14f3_b84183def3af436a9693c3f625042611.pdf
    • https://static.usrfiles.com/ugd/e2c250_2365caac458b4662b051b11c9dd4042c.pdf
    • https://static.usrfiles.com/ugd/43d598_fed06cc0db97483884f2244fb09ccd68.pdf
    • https://static.usrfiles.com/ugd/5b5da7_3c9eea33a7c94c80be36d959a83750b3.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ce5.bin
cbada6b9c8939f872a1cf9c54c60ddd26c3b58d1490b089c1fc6246d31bb6a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE5 5128 bytes
font_01_sfnt_off00007e56.bin
6755be134609ce049884ea0d2c03decbcd03a0c8dcd27c37e1cfceb37f8f1001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E56 15248 bytes
font_02_sfnt_off0000ae0a.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0A 16204 bytes

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