Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c12181736af0192…

MALICIOUS

PDF

40.2 KB Created: 2020-08-24 00:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b417ca9aaff71f8731b0a10b08f6f72f SHA-1: 8c49b4e0394f2765f4d3d1ba3a74032d430c1009 SHA-256: 8c12181736af019257f7122a2ba96440594d6d97152c2bce5149d4105c74d377
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to software modification ('auto sketchbook pro mod apk new version') and includes the malicious URL. The presence of a link farm and a high ML classifier score further support the malicious nature of this document, which is designed to redirect users to potentially harmful content.

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=auto+sketchbook+pro+mod+apk+new+version
    • http://nawukik.mmeprice.org/uploads/1/3/1/3/131383309/riwew_xojonusot_lanadav.pdf
    • http://files.bobclyman-playwright.com/uploads/1/3/1/4/131406985/24d2f.pdf
    • http://xivovum.triplecrownlacrosse.com/uploads/1/3/1/4/131453558/detax.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/nuzupenugaguselaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/nota_novel_bimasakti_menari.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/kenmore_elite_he3_washer.pdf
    • https://cdn.shopify.com/s/files/1/0430/2507/2282/files/organic_chemistry_brown.pdf
    • https://cdn.shopify.com/s/files/1/0443/1986/7036/files/daffynition_decoder_angles_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2866/files/minecraft_mod_on_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/biludetejuvujatolometa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/apache_tomcat_8._0.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_off00005beb.bin
db716b83793d014e9694c4621e1f1996219abe4900cdbc8152da712c74565f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEB 5628 bytes
font_01_sfnt_off00006efc.bin
c7da7720bb7c3ad1a11f101e6d0bca025d1a6439531dbcabda8bf0d0416bd3c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFC 10948 bytes

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