Malicious PDF — malware analysis report

Static analysis result for SHA-256 824b941138c83e0f…

MALICIOUS

PDF

32.5 KB Created: 2020-08-30 22:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 488bbf7799155059727a6c15e01015e9 SHA-1: 9b0105913a3d61e32c3998331b0f63a1b8793868 SHA-256: 824b941138c83e0f0e8c8abf077973e5fad01502eee3ce402d1d5ec807c0a92a
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with a search query. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of a link farm designed for SEO manipulation or traffic redirection. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or redirection attempt.

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.com/wix?keyword=touchstone+level+4+student+book+answer+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5644/7136/files/10962596655.pdf
    • https://cdn.shopify.com/s/files/1/0438/2405/4432/files/kannethirey_thondrinal_mp3_songs.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://static.usrfiles.com/ugd/b8c837_60a47dd4cf294d779d6dabce7d3e3b7a.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5715/files/26257873916.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/40820456530.pdf
    • https://cdn.shopify.com/s/files/1/0436/2023/7475/files/bepusuzero.pdf
    • https://cdn.shopify.com/s/files/1/0433/7460/8545/files/mortal_kombat_x_cheats_ios.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8554/files/bendix_brake_pad_catalogue.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_off000041c0.bin
4b30c080eef337e9e5eba282e4d2b325460b1cddb27b78656fc428c46debdd45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41C0 5520 bytes
font_01_sfnt_off00005491.bin
7d4b5a04678c4dbff852a03db62e31ef755595be2a9ff1d799a2759a9963890d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5491 9616 bytes

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