Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb11bde213bf1f9…

MALICIOUS

PDF

48.2 KB Created: 2020-08-23 15:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a440dbd48f67d0661368f92d9aa834c7 SHA-1: 66e7cd5520325fa1f211bb6204a3537ef56f4fc3 SHA-256: 4bb11bde213bf1f98149bfa51bfd4c0a9f7ee27e53b6c4fb43eb795a618681c0
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that a link within the PDF leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that mirrors the one identified by the heuristic, suggesting a deliberate attempt to redirect users to malicious content under the guise of providing academic resources.

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=journal+of+construction+engineering+and+management+template
    • http://kakak.parahills4.com/uploads/1/3/1/4/131408738/3388005.pdf
    • http://files.thepercolator.net/uploads/1/3/0/8/130813639/76948cb5d1897e5.pdf
    • http://files.greenalt.co.za/uploads/1/3/2/6/132696330/a0fce5.pdf
    • https://cdn.shopify.com/s/files/1/0429/8460/3801/files/9th_class_social_textbook_english_medium.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/wevod.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3779/files/arandanos_beneficios.pdf
    • https://cdn.shopify.com/s/files/1/0432/6621/2003/files/fozividuluxilemirapabi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/rijewamirakilenogerome.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0762/files/furizolam.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/60083868317.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/20367389799.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/kituvemifisatakogix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xopiforosolakalaxelavur.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_off00007965.bin
cc0b4027082bc9e65ad02ae2e85fa11e82e709dd026859e62205c6506bce81f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7965 5464 bytes
font_01_sfnt_off00008be6.bin
33a6fd51782036fc19d68bc063ab649dd156aab8f4738c029779ae649fdfe9c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE6 12316 bytes

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