Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e61da15a39ed73f…

MALICIOUS

PDF

43.8 KB Created: 2020-09-01 23:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2537a1b1ccbb9ae30daf21b44f7bb95a SHA-1: a634715ea596cc98e2443c0f09561c61337e2938 SHA-256: 6e61da15a39ed73f224c2237e4e791b28275082161d9e6c187f9087af5bd7cde
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, https://ttraff.me/wix?keyword=browser+vpn+chrome, which is part of a link farm designed to distribute malicious content. The document also employs a social-engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for malware delivery. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/wix?keyword=browser+vpn+chrome
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6241/8837/files/88367613920.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/94822684133.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/xerenosizafasufadunumaxom.pdf
    • https://cdn.shopify.com/s/files/1/0436/1184/8861/files/noncommutative_geometry_and_particle_physics.pdf
    • https://cdn.shopify.com/s/files/1/0439/8107/8686/files/wupaburebixosifex.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/96799703661.pdf
    • https://static.usrfiles.com/ugd/ae15ca_7f8d9a4ac008488bb4d2db9cd3d3700d.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_e479103f143740d6864f48d40a749bc3.pdf
    • https://static.usrfiles.com/ugd/fe83c3_1be9d126fa4343b486a9851e76f55a74.pdf
    • https://static.usrfiles.com/ugd/87a178_fe4d831b3b4046999929c6908466c280.pdf
    • https://static.usrfiles.com/ugd/c33f71_b8edddd0b75946f5954eb68286c12cc8.pdf
    • https://static.usrfiles.com/ugd/6cfc61_a541bb983f5144e2881fbff1a2b64ca0.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_off00006ed1.bin
2be6218b09fd2f13de3796c39854c9fd85e87817ea294ee528389f5639649974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED1 5132 bytes
font_01_sfnt_off00008041.bin
e9861c04054a70703f7d3ec9e619188083be388c5c7e6cd7a4d319ebf4d6d015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8041 10304 bytes

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