Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36dd0989266431d…

MALICIOUS

PDF

100.0 KB Created: 2020-07-16 05:39:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ee9e043f182da7d614d270abb84fd3f SHA-1: d5df473cc1328dda2391758c4019fda909959e63 SHA-256: d36dd0989266431dcaf43e14e4cc20300e8b46eea6aede279df3e8b03a62bca2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests the document is part of a link farm designed to distribute traffic to numerous external PDF files, likely for SEO manipulation or to obscure malicious destinations. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs, particularly the one pointing to ttraff.com, are the primary indicators of malicious activity.

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/wb?keyword=curriculum%20guide%20in%20arts%202018%20pdf
    • http://files.entomoanthro.org/uploads/1/3/1/4/131483197/nizijeb_toririwinere_lunemepax.pdf
    • http://files.rhondastruminger.net/uploads/1/3/1/0/131071076/1562942.pdf
    • http://files.wheredidmargo.com/uploads/1/3/1/4/131437563/8867403.pdf
    • http://files.lakeisleretreats.com/uploads/1/3/2/7/132740682/xamikexinefekoz.pdf
    • http://files.highdesertptcortez.com/uploads/1/3/2/8/132816202/3957758.pdf
    • https://xajilaxaluv.files.wordpress.com/2020/06/35636432663.pdf
    • https://fifalewev.files.wordpress.com/2020/07/vikis.pdf
    • https://kitafolek.files.wordpress.com/2020/07/ziwivetazinalokaniroxituk.pdf
    • https://gobabosinu.files.wordpress.com/2020/07/tedowivaliwigodagevowi.pdf
    • https://kemetax.files.wordpress.com/2020/06/68641106559.pdf
    • https://vatudim.files.wordpress.com/2020/07/84564473981.pdf
    • https://nenodixivazu.files.wordpress.com/2020/07/13620354731.pdf
    • https://nipadadumunu.files.wordpress.com/2020/07/2149473843.pdf
    • https://cdn.shopify.com/s/files/1/0433/5557/0341/files/bexagebenaxajuxasobodowur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19463184481.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.pdf
    • https://cdn.shopify.com/s/files/1/0431/4346/3074/files/tuxuduxuzelajuzisoko.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2613/files/30516984580.pdf
    • https://cdn.shopify.com/s/files/1/0432/5254/7739/files/86960848892.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bokowolexom.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_off000135d9.bin
e25cee8d21ad4850d1742925a7bcfe8ec93eefacb39c6e3124a5622a99fed79e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135D9 5792 bytes
font_01_sfnt_off00014971.bin
f4138509f6c3cccd318ea941a2a06d60cdcfc380a331610d4658bad490630643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14971 10276 bytes
font_02_sfnt_off00016cc9.bin
9490445898dfce2efecde952c79d4e72eaf4f05a0ec5ed801e3c37b667fc9924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC9 16112 bytes

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