Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1bc34c14de54c5…

MALICIOUS

PDF

47.4 KB Created: 2020-08-08 09:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15b985d6da3cb50ca1485261c15f3a1c SHA-1: 43281d4588fb3c539727b14d2dea41ce8ea9523d SHA-256: ac1bc34c14de54c58f1df1cb6aee7b0eb047e28ff7bd766d0dae0fbc5f1f4ea1
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to domains associated with redirectors or potentially malicious content, such as ttraff.com. The document body, while appearing to be educational material, is a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to known malicious infrastructure.

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=comparing%20and%20ordering%20whole%20numbers%20worksheets%204th%20grade
    • http://files.tailwinddelivery.com/uploads/1/3/1/3/131398347/4f70fcc.pdf
    • http://files.fresnonutritionsolutions.com/uploads/1/3/2/6/132683111/9806049.pdf
    • http://files.therossfarm.com/uploads/1/3/1/4/131437438/novifole-kebuzonugoj.pdf
    • http://files.tatiromo.com/uploads/1/3/0/7/130775364/botodepazezef.pdf
    • http://files.dassiedahan-author.com/uploads/1/3/1/4/131436971/wixodasa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0328/files/boriwidenu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/neboburitezi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1281/5008/files/kate_morton_the_clockmakers_daughter.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/aiag_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/0499/1387/files/does_gmail_automatically_delete_emails.pdf
    • https://cdn.shopify.com/s/files/1/0435/7763/9071/files/definition_of_application_software.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/visual_studio_2008_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0430/6921/0773/files/85267805383.pdf
    • https://cdn.shopify.com/s/files/1/0434/0862/1735/files/zojizotuwumowinanenape.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/77152122424.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/voxarivefiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/letal.pdf
    • https://cdn.shopify.com/s/files/1/0430/3978/5111/files/xabufazolorugad.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_off00006c68.bin
e58b092fcaae560563add181ad56199271830d1fa61f5e5269e165512a9e4c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C68 5664 bytes
font_01_sfnt_off00007f88.bin
f3af38c5e737489b330f97ded4b7d15e07187ff21cd04c301e9a6e97f23dbccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F88 10136 bytes
font_02_sfnt_off0000a239.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA239 4324 bytes

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