Malicious PDF — malware analysis report

Static analysis result for SHA-256 db49fe05c07fd12f…

MALICIOUS

PDF

48.2 KB Created: 2020-09-04 17:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2ce25dd8451044b71b1964af5a6ea8f SHA-1: 37bea789ca5822c6146efb8446cd0a994f94a51b SHA-256: db49fe05c07fd12f45dc6eddbbf42b6dc06c66d02dca35d3a24d2d76d04d6065
150 Risk Score

Malware Insights

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

The PDF file contains a link disguised as a worksheet answer key. This link, however, redirects to a known malicious domain, ttraff.ru. The PDF also contains a large number of embedded links, many pointing to static.usrfiles.com, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious redirector.

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=dna+replication+worksheet+16+answer+key
    • https://static.usrfiles.com/ugd/bc84a3_e238b83e35a34dc1ba5637282196c4e1.pdf
    • https://static.usrfiles.com/ugd/33c377_78691f530bf34b4987ae6786bc6a0962.pdf
    • https://static.usrfiles.com/ugd/b8c837_f63fa5da256941cfae0d6e715e33bf67.pdf
    • https://static.usrfiles.com/ugd/1ee69b_c38ed8ad827f49b397cd13b5c3cc78ac.pdf
    • https://static.usrfiles.com/ugd/99965f_204aa8eda6a7495fa8de66426fda81e7.pdf
    • https://cdn.shopify.com/s/files/1/0435/1701/8267/files/42293641057.pdf
    • https://cdn.shopify.com/s/files/1/0429/1215/3766/files/minecraft._net_server_1._12.pdf
    • https://static.usrfiles.com/ugd/2ac701_25224fe7c3e0406c877fba83f4d06d69.pdf
    • https://static.usrfiles.com/ugd/834936_7eed8951a16a478c81f36a6c8479c638.pdf
    • https://static.usrfiles.com/ugd/b5472a_e59b0aa014724effa9606f339d64382b.pdf
    • https://static.usrfiles.com/ugd/dbbfd0_6ccfe027399d43a7acd7fdb55a0cf118.pdf
    • https://static.usrfiles.com/ugd/516574_f6c955053d2348bfa470a4b04d34ef7c.pdf
    • https://static.usrfiles.com/ugd/9c43ec_24c3677ebb8649f9b41d22ce83cced70.pdf
    • https://static.usrfiles.com/ugd/2274a7_efa2f5b39d914cfe85995cb93181d4b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b291d8e5287540a7a20338fd5a39b0c9.pdf
    • https://static.usrfiles.com/ugd/68ec51_d17c7e450d194ae2814ab8628b32c156.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_off00007e76.bin
ad5508f0ca26a588664afcbff00f27834b6bede7c68c767545f5ac32e2cc85c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E76 5484 bytes
font_01_sfnt_off0000913b.bin
3cc615345208285c63c63bc057ade5dbb6568f69a027a68db30ae4794086f599		 pdf-font-stream PDF embedded font (sfnt) at offset 0x913B 10152 bytes

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