Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd90551f7d22dc66…

MALICIOUS

PDF

81.7 KB Created: 2020-09-02 20:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2000a749bbb1fb49098ad6b223c982a4 SHA-1: 9be4b8214f80873a34e5a7e07e3f11547cb5bfef SHA-256: cd90551f7d22dc66a04a5e13c447c8302ce9730145593919ecc484ec4cf4ba71
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm designed to redirect users. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.club/wix?keyword=barricade+transformers+cartoon'. The document body, though heavily obfuscated, contains this URL, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=barricade+transformers+cartoon
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/libidurekatomanazavevufi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/badoxulepipevofiveparow.pdf
    • https://cdn.shopify.com/s/files/1/0433/3069/9414/files/64545759282.pdf
    • https://cdn.shopify.com/s/files/1/0454/6533/8014/files/antecedentes_historicos_de_la_independencia_de_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0432/6277/1358/files/4036023329.pdf
    • https://cdn.shopify.com/s/files/1/0435/0921/9492/files/gixomafazafe.pdf
    • https://cdn.shopify.com/s/files/1/0439/3975/8235/files/8483512184.pdf
    • https://static.usrfiles.com/ugd/3254bf_44c4fa7da6584bbfb4fd9a728d84abe7.pdf
    • https://static.usrfiles.com/ugd/89064d_d6fb6675db82451a98ae05d10cd57776.pdf
    • https://static.usrfiles.com/ugd/b8c837_84be9afa38154b139808240a5b1dc8c2.pdf
    • https://static.usrfiles.com/ugd/cac9e4_a78787a0ea624eddb785163f17f90e79.pdf
    • https://static.usrfiles.com/ugd/f103bb_e2c0ab4c21254c4abbcf5784951ce234.pdf
    • https://static.usrfiles.com/ugd/b8c837_e05996274a114557ba240fe8438ab133.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_ab047ae1ecc84fa4b94027931b8d6d4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6ba4b36a0154c989d0c4a13047bd913.pdf
    • https://static.usrfiles.com/ugd/b8c837_825bd7d1a2074e9fba7e7e164ce6d92f.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_off0000f5d2.bin
acb85e26d038eddcf84f749663c646e6fa027b23c7b8db7013d830574e1cd82c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 4180 bytes
font_01_sfnt_off00010473.bin
50a92968650e3d1be373bdb8c8ed6341cf22fa685dc24aa1d8026ed7d08946df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 5184 bytes
font_02_sfnt_off00011600.bin
8629d6db3c0d79c6c79debbbdc19664a11b543369228c38fe69d6a92754bd3cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 10240 bytes

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