Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c9ed1e6efe4d63…

MALICIOUS

PDF

40.6 KB Created: 2020-08-23 03:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5d35fecbf40300e410b2d4080bc69dc SHA-1: b6817f0fcdb0ddb3bbedd64e3a4e698922d761ec SHA-256: 40c9ed1e6efe4d63f9566f9cc67316378b2af8d0b7e79fe334bf6ce5e7835522
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to a URL designed to lure users with a search-engine-optimized keyword. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=night+mode+developer+options+android+9
    • http://files.vcmg-us.com/uploads/1/3/2/3/132302732/fukekozosesibodine.pdf
    • http://files.millsupportzuid.com/uploads/1/3/1/6/131637640/635d4c57de57e98.pdf
    • http://files.navarrehigh.com/uploads/1/3/0/7/130738501/38673776e.pdf
    • http://files.artisancenterdenver.com/uploads/1/3/1/4/131437563/c25d2.pdf
    • http://lovubemo.tataspierogi.com/uploads/1/3/1/1/131164394/58269975.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/ruxozovajapaveniz.pdf
    • https://cdn.shopify.com/s/files/1/0435/3726/8900/files/64149222805.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/53385579343.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/kijawapibudisejamigu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/41899929124.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/xituvexegavefolim.pdf
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/piwusijawov.pdf
    • https://cdn.shopify.com/s/files/1/0434/8982/0836/files/brucellosis_in_humans-_etiology_diagnostics_clinical_forms.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/73384417404.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/28455386386.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_off00005f2e.bin
0dc7bf9bc65277bd7d463d2b0dcdc370d0f04661cc26c23b9813bf2fc749e720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2E 5556 bytes
font_01_sfnt_off000071f8.bin
b4bbd9d14d36ccca4a716f1d3e32529f50f96012361fd0fc1a919c41829e37d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F8 10420 bytes

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