Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c630d65aaeb05b6…

MALICIOUS

PDF

54.0 KB Created: 2020-08-31 22:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40230b79d8ccf38318839958f47a8208 SHA-1: 8009f00e828ebdf363aa15f2976e02a2ac3f89c8 SHA-256: 6c630d65aaeb05b6c804decce0d3eac47803dcd5c1ed113a522dce379583133c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/wix?keyword=aravind+swamy+video+songs+free', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other benign-looking Shopify URLs, indicating an attempt to disguise the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=aravind+swamy+video+songs+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/4353/4486/files/28137602688.pdf
    • https://cdn.shopify.com/s/files/1/0434/8205/4813/files/fadujubipopekexipifuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3899/files/kodipovukog.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0309/files/65909561600.pdf
    • https://static.usrfiles.com/ugd/0c268c_f0580c0348e84045a6d39bed73f3e3e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b66af327c13643228fe2a10cfe26f05c.pdf
    • https://static.usrfiles.com/ugd/ea78e0_ab0161dd94fd4f34ad4f2c06635a1065.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4730ad720e74df3ae5810fb30a0610e.pdf
    • https://static.usrfiles.com/ugd/b8c837_165550fb41434e53b50c5e88d018a5fe.pdf
    • https://static.usrfiles.com/ugd/cac9e4_9adc1c63c85246bd86a6afdb987f95bc.pdf
    • https://static.usrfiles.com/ugd/0a052f_808283d52f234860849c9111f1041384.pdf
    • https://static.usrfiles.com/ugd/d775a9_48cb428f460d44b3875d0efb2d2ae795.pdf
    • https://static.usrfiles.com/ugd/1813b3_f64517570866458bb42afa704d75a9ef.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7563/files/tetit.pdf
    • https://cdn.shopify.com/s/files/1/0434/5610/2565/files/80826524737.pdf
    • https://cdn.shopify.com/s/files/1/0451/0393/9749/files/lojixelepiseluzabolobeg.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fd1.bin
b5800e9ededcf64c98488b5003586b440e0d1be5a4881a634e62d9493199833b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD1 5440 bytes
font_01_sfnt_off0000a258.bin
1749494798a8a97af947fc04abafde7c13621732f6624d3f338877d2554729cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA258 12980 bytes

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