Malicious PDF — malware analysis report

Static analysis result for SHA-256 7555cbaca9b8e7de…

MALICIOUS

PDF

42.9 KB Created: 2020-08-11 22:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdba00b3bf8b9e039217b08bae24fa2c SHA-1: c001c8168ec0ad55f872befe7b71c7cdd02f4aeb SHA-256: 7555cbaca9b8e7de2e968c667378efd43297de631b5189e801473b32925f992d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body and embedded links suggest a lure to academic-related content, which is a common tactic for phishing or distributing further malware. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms a high likelihood of harmful intent.

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/pify?keyword=structure+of+dicot+and+monocot+root+stem+and+leaf+pdf
    • http://files.lerobles.com/uploads/1/3/0/7/130776358/wosexidikepome-lisoniregobibu-zebufibalupufag.pdf
    • http://files.poverty-conference.org/uploads/1/3/2/7/132740498/kubutinix.pdf
    • http://files.adyartcenter.com/uploads/1/3/2/6/132681969/pafedani.pdf
    • http://files.addiedraper.com/uploads/1/3/1/0/131070450/528ddbe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5430/8245/files/glider_asw-_27b.pdf
    • https://cdn.shopify.com/s/files/1/0435/5706/0769/files/tasutawinozadefofora.pdf
    • https://cdn.shopify.com/s/files/1/0430/0662/3903/files/gajakunenip.pdf
    • https://cdn.shopify.com/s/files/1/0431/3759/7607/files/12216840290.pdf
    • https://cdn.shopify.com/s/files/1/0431/7632/9373/files/luxuzufef.pdf
    • https://cdn.shopify.com/s/files/1/0439/9664/3486/files/pisinesudorumerup.pdf
    • https://cdn.shopify.com/s/files/1/0437/4613/2129/files/occupational_health_and_safety_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/5011/3943/files/affirming_diversity_nieto.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/xunepenukoxutupavoxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/citoneurin_5000_comprimidos_bula.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/tinapefidilawuzawakono.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/wamepamidosode.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_off000068e0.bin
c6c469f4aa34b7d686157016ba1cfe964d8aa60e325878a374e8740a021620ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E0 5404 bytes
font_01_sfnt_off00007b20.bin
3169871ef042980ad70f103d8f9fc67df3108006d00cd446521bfa44250e351f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B20 10312 bytes

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