Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d46812c7b961e41…

MALICIOUS

PDF

45.1 KB Created: 2020-09-02 05:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 892ac948b6a6be9b0deba802e6c3ed36 SHA-1: 452c792cb9df2681139c1394969da7e506ad0aaf SHA-256: 7d46812c7b961e4193559a510f50f6d2be8c18aed944a00eb9e2601c876602b6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a heuristic firing for a browser extension installation lure, indicating a social engineering attempt to trick the user into installing malicious software. It also contains a link to known malicious redirector infrastructure, which likely serves as the initial stage for delivering a payload. The ML classifier strongly supports the malicious verdict.

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.cc/wix?keyword=chrome+75+offline
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/cc03df_c9913f5c7b4d4b048cc32f1c6de0b8c5.pdf
    • https://static.usrfiles.com/ugd/5ad03d_b13006c6566d4861b5bda1256cc754fd.pdf
    • https://static.usrfiles.com/ugd/96768c_c69704871cad41428aa5f1046a377bfd.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_2326628ebacb4fd4a0472260f266ce71.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/speak_now_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/9820/1502/files/20338725516.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5237/files/65929738478.pdf
    • https://cdn.shopify.com/s/files/1/0428/5687/4151/files/74870741690.pdf
    • https://cdn.shopify.com/s/files/1/0437/7113/4106/files/future_56_nights_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/masha_babko_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0433/6962/7799/files/appareillage_de_commande_electrique.pdf
    • https://static.usrfiles.com/ugd/b972d5_78aa4ed52cc34f9aac4c8d54b70dce5b.pdf
    • https://static.usrfiles.com/ugd/dcfb95_bfec6dee6b9948ce8ba08b33c50aa019.pdf
    • https://static.usrfiles.com/ugd/74a852_4c30ef54bdcb4c1d8e779df7e7fb04cd.pdf
    • https://static.usrfiles.com/ugd/e3834b_50a8ab54ff1c40a6b329962868fd0c07.pdf
    • https://static.usrfiles.com/ugd/8b2c09_f0757f496f9546f68c12376a8c806816.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006755.bin
b894ce2d035cbcbf84b5669cea44752e66ecaf23814595b06714eef160429327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6755 4556 bytes
font_01_sfnt_off000076ad.bin
4f23f3053dcf4932605e4783477a985a5694d1513a6ad72fcff6c498f3abde1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AD 10184 bytes
font_02_sfnt_off00009983.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9983 4324 bytes

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