Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac29582562321f07…

MALICIOUS

PDF

47.6 KB Created: 2020-08-31 14:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18a648b462228c0e214947aeb019e712 SHA-1: 64646b3e7c63ecadbca84d0a7e10e1504f06559a SHA-256: ac29582562321f0716938c99b92a4170ac7a48ad2db60255d21ebe6ef462bdaf
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness. The PDF structure and embedded link indicate a phishing attempt to redirect users 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.ru/wix?keyword=compare+fractions+with+like+denominators+worksheet
    • https://static.usrfiles.com/ugd/b7ab08_6075d583a87a41179e318cd95a5953d6.pdf
    • https://static.usrfiles.com/ugd/9757e7_1e1b67b9c16745108684016769ae303d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8bca322c6d504ac6905a2c2d4d0bb7d4.pdf
    • https://static.usrfiles.com/ugd/e2c250_7e98f43df26b4a6bb1f70c316bcceff6.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5234/files/panofolufunafa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/xavumikizelozi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9925/9031/files/financial_reporting_council_uk_governance_code.pdf
    • https://cdn.shopify.com/s/files/1/0436/9167/1705/files/36413135590.pdf
    • https://cdn.shopify.com/s/files/1/0430/1016/2837/files/understanding_symbolic_logic_free.pdf
    • https://static.usrfiles.com/ugd/850f07_c0dee135a0c54ee3b884aecb73c5f269.pdf
    • https://static.usrfiles.com/ugd/b50c55_01220c53cb2244ba94f3265c8997767c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d92458ecee1c45c6b35af5bffbd129bb.pdf
    • https://static.usrfiles.com/ugd/38eac1_b12f8806b5964120ad010cf5c7500da7.pdf
    • https://static.usrfiles.com/ugd/61f964_e4044dad76dc495aa67bdbb13b136c4e.pdf
    • https://cdn.shopify.com/s/files/1/0434/8120/2854/files/vanujus.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/59038186494.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/functional_analysis_walter_rudin.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/
    • https://cdn.shopify.com/s/files/1/04

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ac4.bin
a1ce51b359c916b2b6d38ab3a93f3d34f1dcd2621ff20fcd4dce7006950e7372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC4 5456 bytes
font_01_sfnt_off00008d33.bin
cd6bdd785e9763178ec69a332d5b4607731638c04a867ee5b334fd64e4302bdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D33 10564 bytes

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