Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd277a5f206a8759…

MALICIOUS

PDF

39.6 KB Created: 2020-09-20 01:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04d9f91547531531f13afc3584a4ecb5 SHA-1: 228488b09e8fb2bdba04248cf1de5ce80b5a0230 SHA-256: cd277a5f206a8759dc1c383046efe14dc6949454da32a3e42c061a6788b3a044
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, with several pointing to known malicious redirectors and link farms. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with the heuristic findings. The primary attack pattern involves luring the user to click on these links, which likely leads to further malicious activity.

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.com/wb?keyword=wood%20badge%20ticket%20worksheet%202018
    • http://files.elementalascension.com/uploads/1/3/1/4/131437953/gawogilopog.pdf
    • http://files.jubeeleeglass.com/uploads/1/3/2/3/132303151/zofokexavevazelemew.pdf
    • http://files.bssda.org/uploads/1/3/1/4/131438641/3201920.pdf
    • http://files.sashazeilig.com/uploads/1/3/0/9/130969151/xopobugoradigov.pdf
    • https://a3046d7e-b78e-43e0-8b66-28168d86b9e9.filesusr.com/ugd/12daa7_8bfc870d7568488e940aa0fffb87f446.pdf?index=true
    • https://1f4c71fd-9cb6-4f40-b2a7-b130621f5f16.filesusr.com/ugd/1b6cec_d00fc358dd9845c3af3084942f1aa443.pdf?index=true
    • https://52c61f1b-cbc5-4a8b-96f0-40f5f7875a03.filesusr.com/ugd/a01749_c8fd52d3300944399763ea8d01e6a95d.pdf?index=true
    • https://3754aede-2389-4023-bad5-f9f741b2f4cd.filesusr.com/ugd/078c79_a059dc512d9d499586f7ad08243f79cd.pdf?index=true
    • https://86db7f38-6c29-4fce-85bf-58bce509b503.filesusr.com/ugd/6f9b04_2cafa685013f44e3bf1d54b56bc4fcae.pdf?index=true
    • https://7a3fa5a1-7193-4448-8d6b-db687d77e6c6.filesusr.com/ugd/2486b5_877ef6e3f36a417f87346fffa1650009.pdf?index=true
    • https://d78554a8-176b-4fd4-a0dd-fd24edc6951b.filesusr.com/ugd/eda9ba_e04cc7baf83f43188c628a2ad33fe001.pdf?index=true
    • https://b478aa73-178c-4e54-ad78-460bf996ae72.filesusr.com/ugd/384ea4_ac59adc45aeb4d78a494fc3c90dad94a.pdf?index=true
    • https://e5684375-a05d-4a70-b514-d61b896756cd.filesusr.com/ugd/ea2c45_2ec3fe2e503143d193d41e9e8e3e7e68.pdf?index=true
    • https://11d97126-fdc8-4b46-b56c-695a92232a5b.filesusr.com/ugd/9e41f0_faf5d09cfc7e406dae714362d56fab77.pdf?index=true
    • https://16b4c9c3-8081-42b0-9a3f-0185971c46de.filesusr.com/ugd/decf6f_46619df4d5974e839ad4f3c82c01f960.pdf?index=true
    • 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_off00005b5a.bin
8a9549babc5fed8ec6d9d1dab103469d17c58fb688482074663c88d5bb9552a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5A 6000 bytes
font_01_sfnt_off00006fe0.bin
567c0fe5efa24d48c32e74e877753759e172d3a19793ebf05d4eb680c88681a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE0 9932 bytes