Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a74929eeebcdbd…

MALICIOUS

PDF

58.0 KB Created: 2020-08-13 15:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a93d0d6b3c1e9bc1d6f45877010e3c1c SHA-1: ebf13b161f1d15d14d2fa11bd9bfefb19fc20642 SHA-256: a9a74929eeebcdbdb3debdfe7bf132dd75892daab0e752cb2d26100d8650822e
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a high number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/pify?keyword=libros+de+benedicto+xvi+pdf+gratis. Another critical heuristic noted a PDF link farm, with many links pointing to external PDF files hosted on domains like cdn.shopify.com. The document body contains garbled text but includes the same malicious URL, suggesting a lure or redirection attempt.

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=libros+de+benedicto+xvi+pdf+gratis
    • http://files.leonoressuite.com/uploads/1/3/0/8/130814605/f2850a.pdf
    • http://files.melansonmotors.com/uploads/1/3/1/1/131164236/1428578.pdf
    • http://files.carolinefreudenthal.com/uploads/1/3/1/8/131871621/numufojoxu-sotorimazipa.pdf
    • http://rifera.rittenhousementalhealth.com/uploads/1/3/2/8/132814170/sosofumatewekivi.pdf
    • http://files.preparednesspeace.com/uploads/1/3/1/4/131455832/nenatuto.pdf
    • https://cdn.shopify.com/s/files/1/0432/8803/5486/files/school_of_alexandria.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/60858075912.pdf
    • https://cdn.shopify.com/s/files/1/0449/7162/2559/files/self_certify_sickness.pdf
    • https://cdn.shopify.com/s/files/1/0434/7310/9152/files/bhagwat_geeta_yatharoop_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0376/files/65821659397.pdf
    • https://cdn.shopify.com/s/files/1/0439/3431/8760/files/47179918840.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/zagiwed.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/22518042397.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3144/files/jimojajadifalusedisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/65929808338.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_off00009f49.bin
c4bd5eeec1eb2755f026b479cb3f39902248289a9329c81e56f4afed81151d1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F49 5500 bytes
font_01_sfnt_off0000b20d.bin
b2e8350e53bbea4b4a7bd560d7e99b94ad3492edb066527b97b1859a95693784		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB20D 12748 bytes

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