Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af414c85f75b956…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 08:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f93f5d3dccbd99078e0847b5cbe48b94 SHA-1: c776149072341574c526845b4b8ec1adba6277ef SHA-256: 3af414c85f75b9565dc9c536f6e766354800c68378f974cf548d5a233a4a7e69
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=determining+probability+with+candy+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to Shopify and static.usrfiles.com domains, likely for SEO poisoning or to obscure the malicious redirector. The document body, though heavily obfuscated, contains the same malicious redirector URL and a benign-looking PDF link, suggesting a lure to a malicious site.

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=determining+probability+with+candy+worksheet
    • https://cdn.shopify.com/s/files/1/0453/9623/0312/files/history_of_greek_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0428/6762/2055/files/fizixotumawuwarididin.pdf
    • https://cdn.shopify.com/s/files/1/0432/7132/3804/files/daxoguxo.pdf
    • https://static.usrfiles.com/ugd/36f25b_e91a01d8078c4baa9b71b8220982a8de.pdf
    • https://static.usrfiles.com/ugd/576447_c5b22f4f20a841459fb0f0fbba332f6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_039835a708814282a1dc5d2e04d0ec66.pdf
    • https://static.usrfiles.com/ugd/9cb927_084cf28435a04c77a8885ee039a45ff4.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4367/files/catalogue_schneider_electric_automatisme_et_controle.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/mukon.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/chinese_ghost_story_game_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/c_open_directory.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e7e3e65401943a5aa08e868718d254c.pdf
    • https://static.usrfiles.com/ugd/83b1b3_80fc3bbba9154f7abf5901865cb0a4b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa69dcda05904dac861d848e4ad6c543.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_db635500abbf47c5a71e66ecee4557f7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e86.bin
66ddd0ffe54a14006ca483c59b2bc93beba9279819431cc24948cdea9c7cea2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E86 5884 bytes
font_01_sfnt_off00007274.bin
6dd7c984a290190bdc1ea69ab9254136dfe97e2aaa8910dc1061280e6b6780d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7274 10136 bytes

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