Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10ea4ff1eabf7e7…

MALICIOUS

PDF

47.2 KB Created: 2020-07-12 23:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f04d0149311c1e07b51f2a7a7bea26b SHA-1: 106bca0721c55efe7661ec2f415d1a01d598586d SHA-256: c10ea4ff1eabf7e7e73773c4c3821dc204e5aef9ee8b5f3e6ae1f8d77b898bfb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains designed to appear as legitimate file hosting services. The primary redirector URL, https://ttraff.cc/, is known for malicious activity. The document body is heavily obfuscated and likely contains further malicious content or lures, but the heuristic firings clearly indicate a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=spanish%20vocabulary%20for%20beginners%20with%20pictures%20pdf
    • http://files.nokillhuntsville.com/uploads/1/3/1/4/131455883/jalupi.pdf
    • http://files.kyleedavid.com/uploads/1/3/1/4/131438891/1073798.pdf
    • http://files.jaylethbridgephotography.co.uk/uploads/1/3/1/3/131383383/1695851.pdf
    • http://files.roger-pugh.com/uploads/1/3/1/4/131453018/8926736.pdf
    • http://files.bodysoulcenter.net/uploads/1/3/0/7/130740433/3357673.pdf
    • http://files.whitepeacockcoffee.com/uploads/1/3/1/4/131436971/7dad80.pdf
    • http://files.koepplinkicking.com/uploads/1/3/1/8/131871730/4abaaf8ce6ff.pdf
    • http://files.northcountyhumanresources.com/uploads/1/3/0/8/130813885/375681e5aeaff.pdf
    • http://files.macrobites.com/uploads/1/3/1/0/131071057/09b885bf5.pdf
    • http://files.flowersbyroseus.com/uploads/1/3/1/3/131381712/xunomifimi.pdf
    • http://files.northcountyhumanresources.co
    • https://gikigofuleru.files.wordpress.com/2020/06/18454109411.pdf
    • https://bosigidofo.files.wordpress.com/2020/07/giwolozibi.pdf
    • https://babigedumig.files.wordpress.com/2020/07/vobazobelogi.pdf
    • https://mitalaj.files.wordpress.com/2020/06/83755320677.pdf
    • https://kuvilagegap.files.wordpress.com/2020/07/musebepolivopogawew.pdf
    • https://cdn.shopify.com/s/files/1/0433/1782/1605/files/41159329925.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tebagomi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/fixakupupov.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/52543904944.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/fajunuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/44652197939.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_off00007998.bin
783413a3af27e754921a7bb62800a59df988976fccae3bf66a6c6b7bd6c5183d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7998 5796 bytes
font_01_sfnt_off00008d4f.bin
ebf0aa2e89ce82b2102c3037955f5a7719623b4c935b2be0516dd1d61b31c834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4F 9872 bytes

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