Malicious PDF — malware analysis report

Static analysis result for SHA-256 21caea472bb93da1…

MALICIOUS

PDF

44.7 KB Created: 2020-08-29 16:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 047ffd9a118cdb8209de0126b0e78adc SHA-1: 2f4315c754d152a07cdc8e81e5e3d655b7813e62 SHA-256: 21caea472bb93da1d24afb8659094ee78dad7a45938f01cc22d3775d1354d559
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=printable+korean+worksheets+for+beginners'. This URL is presented within the document body, disguised as a resource for 'Printable Korean worksheets for beginners'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=printable+korean+worksheets+for+beginners
    • https://static.usrfiles.com/ugd/b8c837_9d400996ab0e4c05ba85024b67e10cf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a9a48cdaf0d4a12b9854da07d65e756.pdf
    • https://static.usrfiles.com/ugd/b8c837_31b9de4785a74f6d8c7e70ad1ce593df.pdf
    • https://static.usrfiles.com/ugd/b8c837_beda2112739f4224a552c0d643a189dc.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/jivaxikafotabopirag.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/ganewolubopoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0319/files/58824462524.pdf
    • https://static.usrfiles.com/ugd/e02969_a5f204c723104c039ad80fd12a7736ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_7383c48d06cb41799bd6d22c2e475cff.pdf
    • https://static.usrfiles.com/ugd/b8c837_dac046756b5645e0902e25a83b11bb75.pdf
    • https://static.usrfiles.com/ugd/b8c837_33aeefd1a1374985823a45c691e6da1a.pdf
    • https://cdn.shopify.com/s/files/1/0429/0671/4268/files/auxiliaire_etre_et_avoir_cours.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/addition_and_subtraction_of_polynomials_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/3063/3881/files/how_to_move_files_in_linux.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_off00006aac.bin
a144d889b12ab321744765ad0597ebfeb1f6714d808bebf7ad6b04fbbb156ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAC 5328 bytes
font_01_sfnt_off00007cd4.bin
275d5d368dec1364efc770449a715eb155fb7c3ebb1de27d5c504f01a97ae0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD4 12096 bytes

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