Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5551dffe196907…

MALICIOUS

PDF

36.1 KB Created: 2020-08-16 20:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ff09833dc57bec68fc07c0000e2bb51 SHA-1: b56da06291b809440d87cca724a1c03472ddef84 SHA-256: fb5551dffe1969071b3b8d20b3fd31ef7027d9e64b349da82f2b84b497c03dee
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL `https://ttraff.cc/pify?keyword=chrome+metal+texture` is a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on Shopify and other domains, suggesting a large-scale distribution effort. 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.cc/pify?keyword=chrome+metal+texture
    • http://files.fraeuleinb.com/uploads/1/3/0/8/130813330/3980197.pdf
    • http://bixox.pimphallpark.com/uploads/1/3/1/8/131856158/najajufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/vonajorab.pdf
    • https://cdn.shopify.com/s/files/1/0431/8714/2818/files/42113320689.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/76612934910.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/wananox.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/email_writing_samples_for_tcs.pdf
    • https://cdn.shopify.com/s/files/1/0438/8706/7291/files/esl_definite_and_indefinite_articles_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/bufesapilerukovugaliredu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1767/files/68314476881.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_off0000532a.bin
baa983bee739b88b7faae1c4fa846119afde595ace398439f5c45054eb2b094f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x532A 4720 bytes
font_01_sfnt_off0000630b.bin
b2c359eee5b7e04279616d7c3a225a8a3322fa0b7e90b0f30f6d60e63d60cfb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630B 9768 bytes

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