Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da429b40ebe0e5d…

MALICIOUS

PDF

49.9 KB Created: 2020-08-17 09:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c2719d2da537974500d8068b8615776 SHA-1: bb94cad923c7757bb13268011a108eee0f25ea9d SHA-256: 3da429b40ebe0e5dbbdc38b38a2632d0f876bb650b52f2d18084f6775eb5a2cd
150 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as an apartment maintenance checklist. The ML classifier strongly indicates maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. No scripts were extracted, limiting the analysis of further payload delivery.

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.ru/pify?keyword=apartment+preventive+maintenance+checklist+template
    • http://wifube.stillnessrocks.com/uploads/1/3/1/1/131163494/nivafite.pdf
    • http://files.templetonauctioneer.com/uploads/1/3/0/8/130813747/kukadanon.pdf
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/58518268620.pdf
    • https://cdn.shopify.com/s/files/1/0439/1773/8152/files/academic_reading_and_writing_skills.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/acs_study_guides.pdf
    • https://cdn.shopify.com/s/files/1/0431/2691/5239/files/riwudulugonerepurokekid.pdf
    • https://cdn.shopify.com/s/files/1/0451/3182/5317/files/dfinition_algorithme_informatique.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/fiwezanezurugawiki.pdf
    • https://cdn.shopify.com/s/files/1/0433/8846/9398/files/jilireredoputefibako.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/antimicrobial_resistance_journal.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9968/files/61216008745.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/potagiwudexi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/29279374766.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_off00008485.bin
607dbd0223d3526a68e4a660bdae9773fea990a2ef06324fe07fe8ed6b6103cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8485 5288 bytes
font_01_sfnt_off0000964e.bin
05e121b1fdc46446c98ddd08ecff6159b40285b89ebabe77af67ed9b94d41b76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x964E 10748 bytes

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