Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bad5a213cfc906…

MALICIOUS

PDF

40.1 KB Created: 2020-08-30 03:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1804752ef1f24e78ed2714bffe36248c SHA-1: c2ff30e7945c52d97aaff0f09607dd7fe5213712 SHA-256: 21bad5a213cfc90626f3d353c391f92787c4f496e197c55098144088526f47c5
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This indicates a likely attempt to lure the user to a malicious site, potentially for credential harvesting or malware delivery. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=struttin+with+some+barbecue+louis+ar
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/85912575351.pdf
    • https://cdn.shopify.com/s/files/1/0463/0786/8834/files/rexax.pdf
    • https://cdn.shopify.com/s/files/1/0430/0737/7567/files/15366490138.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/tanonaranivejitaridunimi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2480/0154/files/cours_anglais_bac_maroc.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/gexulabonunazuvoz.pdf
    • https://static.usrfiles.com/ugd/b8c837_27a585d233e94e27a2dc28e0bd69e478.pdf
    • https://static.usrfiles.com/ugd/c5d40f_f8ba1b711e404b92a07b9cf48e787fea.pdf
    • https://static.usrfiles.com/ugd/b8c837_69864e2194be4bcab8c9cf96bf64d9ec.pdf
    • https://static.usrfiles.com/ugd/ed64d2_7b9c17d711fa4f4488d23921c0c92c37.pdf
    • https://static.usrfiles.com/ugd/b8c837_02e544cf5f764d3da42813614eae20a7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f33.bin
a1b2a7b7a09f1c435fde2d8ec1fa1f2d7537c90bab0ec7a925d8f8bed068b6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F33 5372 bytes
font_01_sfnt_off00007153.bin
ac723ab498c4529617ef84b6c1aad87292cb8925b66ae444f5048e3b4c1f9440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7153 10088 bytes

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