Malicious PDF — malware analysis report

Static analysis result for SHA-256 190ec79ffda0977e…

MALICIOUS

PDF

42.7 KB Created: 2020-09-02 19:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c5b6f5fc23a7f1c8fc92c09ed2ac39f SHA-1: 9159dbfe491b57d69c59bf64330586e394553ba0 SHA-256: 190ec79ffda0977e958ded1a315939142d47b177014c7f20ff7733bcc07a47e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of a large number of external PDF links, many pointing to 'usrfiles.com' and 'shopify.com', indicates a link farm designed to obscure the malicious destination. The ML classifier also 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.cc/wix?keyword=create+birthday+song+with+name+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/735189_a1a937fd99c64d2d99f2caf19a165491.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_fc3f87a0228b48c990ff3d89cbe4611f.pdf
    • https://static.usrfiles.com/ugd/b8c837_57ff512707e844248063155b12a8eefa.pdf
    • https://static.usrfiles.com/ugd/008e52_65ed37e4465c464dacc91c91a7857444.pdf
    • https://cdn.shopify.com/s/files/1/0438/4371/5222/files/18045343315.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/30607230465.pdf
    • https://cdn.shopify.com/s/files/1/0436/9573/4937/files/79412370330.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/28675032343.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3907/files/ligugikugo.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_01690c56d9a04f3ba593273caec6aa20.pdf
    • https://static.usrfiles.com/ugd/35dc59_d72c6cc1b6504c12bbf6b02a45ea0b54.pdf
    • https://static.usrfiles.com/ugd/f459ea_cb1fed7ddf34478ab19a4bfdcee9501e.pdf
    • https://static.usrfiles.com/ugd/fb41f9_197c1828ad8344e4ae0793f7eb5fc78b.pdf
    • https://static.usrfiles.com/ugd/0789d5_6a927e6dda91493bb99c65b80b7da2a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d99c5cff958414d9f97e2035af8e32a.pdf
    • https://static.usrfiles.com/ugd/2486b5_1b82f958d942448e8d741ed6d35dba70.pdf
    • https://static.usrfiles.com/ugd/87b9a8_a13f4341f4f740ab8cb368497ccc532d.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_off000067de.bin
0bbacb5565138d60ca3b8b47d6538e9b69b777cbea3b2f91da29da2c8076e3b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DE 5528 bytes
font_01_sfnt_off00007a91.bin
2bf9ba4dc84c63d6b028fa4c73062a67ec56fcebaa7ae4e37a2ab58ceddd3b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A91 10272 bytes

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