Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5774d5ce234529…

MALICIOUS

PDF

43.8 KB Created: 2020-08-31 10:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff33cd432835976eb5f7c677ef4489f SHA-1: 2e425642aeb3c1c421ec4d5da1b69f0e285653e7 SHA-256: db5774d5ce2345290168a8280bf7fd3accd074a45c0debbd7ddbd7ab9ab5e182
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a search result for an academic book. This indicates a phishing or social engineering attempt to direct users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector. No scripts were extracted, limiting the analysis of further payload delivery.

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=the+sanford+guide+to+antimicrobial+therapy+2018+48th+edition+pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0922/files/calculus_stewart_7th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8272/files/52985644577.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9136/files/zombie_catchers_hack_mod_app.pdf
    • https://cdn.shopify.com/s/files/1/0437/7562/3320/files/daxokabobalojav.pdf
    • https://cdn.shopify.com/s/files/1/0437/0235/4070/files/player_s_handbook_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0438/6055/7974/files/68_degrees_f_to_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/flat_rate_manual_auto_repair.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2283/files/attestato_di_prestazione_energetica_esempio.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/biomedical_instrumentation_ebook.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3334966fe6b43e2bbe3bd8359314241.pdf
    • https://static.usrfiles.com/ugd/8ba634_f0a15bd712c142a1819077b673daa124.pdf
    • https://static.usrfiles.com/ugd/c7a620_40876babc40a4fe6a8884f2f645aed8b.pdf
    • https://static.usrfiles.com/ugd/824332_4e454798bc894c8685d56be5faec9e4d.pdf
    • https://static.usrfiles.com/ugd/5af86b_5f57c57ef455426baae5230f582e6cc9.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005183.bin
ce56487b7052b0fa4b5cdb9f2f8f82690a948e578218ed9de9fc653eb3972725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5183 6248 bytes
font_01_sfnt_off000066a0.bin
f239d2978cfe489760d87f30bbf2b40fa3ab9407c0cc7d2f83ecdaaf50de39be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A0 14704 bytes
font_02_sfnt_off000093ac.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93AC 4324 bytes

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