Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81d3a7721a04c60…

MALICIOUS

PDF

116.0 KB Created: 2020-08-06 23:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad30817ffece87d8064b4526f202f1ea SHA-1: 0363574933d47070ef0f9469ef4d734c0ce605a6 SHA-256: e81d3a7721a04c60456258558573b2f3b91f399b0e59a1b268740e500f170ddc
158 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm with numerous external PDF links, many hosted on Shopify. The embedded JavaScript stream and ML classifier further indicate malicious intent. The primary attack pattern involves luring users through a seemingly innocuous PDF to a malicious redirector.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=vocabulary+games+and+activities+peter+watcyn+jones+pdf
    • http://files.g2gdrivingacademy.com/uploads/1/3/1/4/131437318/9642682.pdf
    • http://files.seldomimages.com/uploads/1/3/1/4/131412032/c4e4cbcf7507.pdf
    • http://files.artistsnorthfork.info/uploads/1/3/1/3/131380263/6827460.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/20484110627.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/85197400009.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/56103574279.pdf
    • https://cdn.shopify.com/s/files/1/0437/8945/1425/files/lijefojavikanabubigil.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/poseziwabubatupizizuxub.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/nigedowopugebebejupugalur.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/33086611511.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/94176038909.pdf
    • https://cdn.shopify.com/s/files/1/0446/3240/8227/files/delete_heroku_app.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/59725789040.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8246/files/39428137542.pdf
    • https://cdn.shopify.com/s/files/1/0437/7637/6983/files/7_seeds_ending.pdf
    • https://cdn.shopify.com/s/files/1/0445/6952/6436/files/varicose_veins_during_pregnancy.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/range_rover_owners_manual.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_off0001875c.bin
aec69c9aef681313bf4ed94171425771d8d4ed566a8c76deeb8bb5d14cfa7862
pdf-font-stream PDF embedded font (sfnt) at offset 0x1875C 5908 bytes
font_01_sfnt_off00019b84.bin
5647437f9d47e8e9c417fd60e6f790d812f58e88f59d639f226e1783d792bca9
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B84 10916 bytes