Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efcdbdddb9544b5…

MALICIOUS

PDF

39.3 KB Created: 2020-08-05 16:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02207e1d0dc3cf7e7622757d5064e004 SHA-1: 5580072122826bae04ac03b83fcc8f0006306d1c SHA-256: 8efcdbdddb9544b51ba208e1befb10b0f4b4b0ae1487786b440829a8c7d54051
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a download for 'Manorama year book 2020 tamil pdf download'. The primary malicious URL, 'https://ttraff.cc/pify?keyword=manorama+year+book+2020+tamil+pdf+download', is a known malicious redirector. The document body, though heavily obfuscated, contains this URL and numerous other links hosted on cdn.shopify.com, likely to improve search engine ranking and mask malicious intent. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=manorama+year+book+2020+tamil+pdf+download
    • http://files.accentrixsolutions.com/uploads/1/3/1/3/131384424/8577243.pdf
    • http://files.kylacorbett.com/uploads/1/3/0/8/130813510/efc08fe5bec61.pdf
    • http://files.jfrancoist-shirtsdesigns.com/uploads/1/3/0/7/130775245/3280940.pdf
    • http://files.truelightacademy.net/uploads/1/3/0/7/130775231/67ca63e0.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3307/files/tezifilipukavasubeli.pdf
    • https://cdn.shopify.com/s/files/1/0437/7178/9469/files/attestation_sur_l_honneur_990i_gan.pdf
    • https://cdn.shopify.com/s/files/1/0428/8164/6758/files/ua_ranger_5e.pdf
    • https://cdn.shopify.com/s/files/1/0429/9007/6067/files/bebolobogunazawonoziwuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8598/6982/files/garefajinivumilenifoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/11975363346.pdf
    • https://cdn.shopify.com/s/files/1/0434/4512/5281/files/jomuraxemilamobasabuxipuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/garaxusev.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0904/files/cells_tissues_and_organs.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/zelag.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/42648171018.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_off0000595c.bin
7b4ed35960bc8de446bc00ba66bd4cc5185eea8973f1ed17529bc25b40d3bfc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x595C 5684 bytes
font_01_sfnt_off00006cc8.bin
bc5a0e6b83bf8a6f5963024167148f64c31e9e536e25242476acbc67662d4f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC8 10464 bytes

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