Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c905436943b3ef7…

MALICIOUS

PDF

46.0 KB Created: 2020-08-31 03:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a3b59ec07b79e0c98594645fc9d955a SHA-1: c9e261656a4eceadbc3858b01c881e8343d2d268 SHA-256: 6c905436943b3ef72ad356a2e67b484372e2129b37a4f44acf52ec106d26e441
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/wix?keyword=neuvaine+saint+antoine+de+padoue+pdf. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to user-uploaded content. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking title, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the presence of malicious links and the link farm heuristic indicate a likely attempt to redirect users to malicious content.

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.cc/wix?keyword=neuvaine+saint+antoine+de+padoue+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8bbd7_476aadf2500f4d90ac0973fbe4f7d1e2.pdf
    • https://static.usrfiles.com/ugd/18f527_6a6d0cba8d494993a7a85a3cb7068cc3.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_09c48a6fe248498ab70f8190368925ba.pdf
    • https://static.usrfiles.com/ugd/bae363_db6564c18bbc4ccf95cf07ed15d0c7f4.pdf
    • https://static.usrfiles.com/ugd/5b604d_44292ceccbf44ef5a110673bb9fbe229.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f04cd1d5bf24fbf826107b5be1cdce4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9d6be1a28a548239a37b2455aadb723.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f125fccc3ae4256ac7835c55a89af43.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/10668876832.pdf
    • https://cdn.shopify.com/s/files/1/0438/3988/1376/files/tapigozefelap.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6022/files/vekabin.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/57166366486.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8de0b5250514b5fb7de2c281ec5ba82.pdf
    • https://static.usrfiles.com/ugd/906e9f_29607d1b977b4a2eaefe5b5dae5fe305.pdf
    • https://static.usrfiles.com/ugd/67e251_aaca9911d0a44d67afe765b3b947423a.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_off000070c6.bin
bbe1a46365527cfc9497cf1be2ff366a99be06facf631a1fcceb1243e55d6182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C6 4936 bytes
font_01_sfnt_off000081b5.bin
8ba576bfbb5c415a41c806bd53285407424ef950dd80f00b78319dd84a943152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B5 12844 bytes

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