Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e087561ee0ae79f…

MALICIOUS

PDF

45.7 KB Created: 2020-08-01 21:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42f43b459fd912bdc9727eebc4e2fd55 SHA-1: fec5c254f63b6e09176926316dcd7f96088aa669 SHA-256: 0e087561ee0ae79f1c273b0d2e7a4955f9751bf07c0340524400e4f7bf7266ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm of 16 external PDF files, with one link pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The embedded URLs suggest an attempt to direct users to potentially harmful content or further stages of an attack.

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.com/pify?keyword=1920%252F+2+calculator
    • http://files.rogartscouncil.org/uploads/1/3/0/7/130740318/c0221de9a.pdf
    • http://files.matrixalgorithmsinmatlab.com/uploads/1/3/0/9/130969238/a4e9b83895d.pdf
    • http://files.kmsphotos.com/uploads/1/3/2/3/132303359/kudexigijogo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/37379844586.pdf
    • https://cdn.shopify.com/s/files/1/0430/2811/9706/files/40099191192.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/37806488172.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/gipakepotemokor.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/57520012301.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/685063887.pdf
    • https://cdn.shopify.com/s/files/1/0429/5357/2515/files/93951874471.pdf
    • https://cdn.shopify.com/s/files/1/0437/6195/9073/files/65567012513.pdf
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/bategadadoziduxupekizis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4996/files/wapami.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/28227954511.pdf
    • https://cdn.shopify.com/s/files/1/0440/0427/8422/files/15427644152.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/72327442299.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006404.bin
8187145963fbf8e0b7977f93bb9cbfc296fb812f6e2b6f40a3c8d31ca5a797a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6404 6744 bytes
font_01_sfnt_off000074eb.bin
104de06b3ebc70a52be5a43b16dfc4704b8e9dfd8819df485ba855f4204aab73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EB 5040 bytes
font_02_sfnt_off00008629.bin
3aba596a73770fc4c54e7877e6712fc2624b55a7b47e502403398e1d6b0b7360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8629 10328 bytes

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