Malicious PDF — malware analysis report

Static analysis result for SHA-256 87704b283a959360…

MALICIOUS

PDF

84.3 KB Created: 2020-08-06 00:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f1530e19858f16bb47da30f32583649 SHA-1: f76a68f5d87b21473dcbe44406acdec2fd0f4301 SHA-256: 87704b283a959360b1f6630ea60c1a3daef9a163131b11cfd43c34435644c3a7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The PDF also hosts a large number of links to other PDFs, suggesting a link farm or SEO manipulation tactic to drive traffic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.com/pify?keyword=arithmetic+progression+pdf+download
    • http://files.caravancreative.org/uploads/1/3/2/6/132682542/e788d.pdf
    • http://files.wisteriasage.com/uploads/1/3/1/0/131069781/devinebi.pdf
    • http://files.norwaygenealogybyjeanmarthaler.com/uploads/1/3/2/8/132814996/cb173.pdf
    • http://files.theperfecteventltd.com/uploads/1/3/0/8/130874284/9ca91779dd92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/83637173022.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/rukugonixefesudupedavinov.pdf
    • https://cdn.shopify.com/s/files/1/0429/0953/2323/files/vulaxigelelef.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/zulademebudijigar.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/jifiwosolenotavisapi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1561/8203/files/33211871554.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/19667363652.pdf
    • https://cdn.shopify.com/s/files/1/0440/6683/2534/files/kupomezofebovokirobu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2855/files/3019222316.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7791/files/24700564260.pdf
    • https://cdn.shopify.com/s/files/1/0432/0913/0143/files/sociological_perspective_on_health.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/wajem.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4c.bin
d7830207e465abc25bb18bf8a0b091b0f53f20d03e3335eab4e841424eccdfe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 5652 bytes
font_01_sfnt_off00010172.bin
4c24eb368ad68c39ac5b2b6830a7e591f2e81ec9b568317c849134146188cfd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 14304 bytes
font_02_sfnt_off00012ede.bin
51b8d4c4f17389d80b23040d591c0dccb099bca9103ea84f58116e310badbe13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDE 16088 bytes

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