Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f49cf18cc30b737…

MALICIOUS

PDF

138.8 KB Created: 2020-09-09 01:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce74eec42db8ff21e5657136182fc655 SHA-1: 16e8b57abd71a9d7b0fc535d55e9cdc6b1a012be SHA-256: 0f49cf18cc30b7377bad52e03883b0da103c7650da612645ee26b4f57bf7feac
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically 'ttraff.me'. The document body, though heavily obfuscated, also contains a reference to this URL, suggesting it's the primary lure. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate it's part of a link farm designed to redirect users. No scripts were extracted, but the presence of malicious URLs is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.me/pify?keyword=aasld+ascites+guidelines+2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0451/7930/6135/files/kupotofegugejobofigib.pdf
    • https://cdn.shopify.com/s/files/1/0439/0912/0152/files/vanifebinaga.pdf
    • https://cdn.shopify.com/s/files/1/0430/6488/5402/files/75907324396.pdf
    • https://cdn.shopify.com/s/files/1/0438/5865/7430/files/stamford_alternator_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7096/files/impersonal_report_structures.pdf
    • https://cdn.shopify.com/s/files/1/0454/6763/1782/files/bartending_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/38013111022.pdf
    • https://static.usrfiles.com/ugd/9dda13_6400c59360064c9a90f760751a473815.pdf
    • https://static.usrfiles.com/ugd/80685d_617fa8a0f54341e5a6182496ded3f587.pdf
    • https://static.usrfiles.com/ugd/fac845_ec6b973f0107424dbf11e81aebf41a0e.pdf
    • https://static.usrfiles.com/ugd/4826f5_575f929baae84f65bf7c465929e87b62.pdf
    • https://static.usrfiles.com/ugd/0582e0_5fbe514e233f4e1fa8dc6e9deb48a727.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_off0001d0a6.bin
68875a17bb4f563ffa1115f6be28283303f3b6f99d6871ba3c2d2cb3b62a9396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0A6 5520 bytes
font_01_sfnt_off0001e37f.bin
62208c66193061f929fbbd11689bc0125290c0ee66356759c1a3cb030f27b6c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E37F 11112 bytes
font_02_sfnt_off000208b3.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x208B3 16060 bytes

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