Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad66101504bc1ee…

MALICIOUS

PDF

42.0 KB Created: 2020-09-03 09:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9790f1bf7e3a6206dc3e86509a1804b SHA-1: 2c120a00699a48d02db1b38f41aa3b8f2869e5ed SHA-256: cad66101504bc1eef9db8c4d99b83eddc7c9b95aa538133f8c46947632ed425a
150 Risk Score

Malware Insights

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

The PDF contains a lure related to the 'Admit card bihar board 2018' and includes a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the same URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, one of which is identified as 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=admit+card++bihar+board+2018
    • https://static.usrfiles.com/ugd/06497e_411da65eac9a434cb4a57b3cc953daf3.pdf
    • https://static.usrfiles.com/ugd/b8c837_15b281b7a1174926accdf296b76d35f8.pdf
    • https://static.usrfiles.com/ugd/72216b_941af1927d584de4aad49503f17befd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_64868b7e3afa4005ab0bfa9053173533.pdf
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/70676787975.pdf
    • https://static.usrfiles.com/ugd/f6a907_f3bf73927dc74b899cf532c1e57b292b.pdf
    • https://static.usrfiles.com/ugd/4f270c_fe4c9415ca054324a9283c717810fb8f.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/chain_rule_worked_examples.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/84217924125.pdf
    • https://cdn.shopify.com/s/files/1/0440/6896/2469/files/xizevukivenulul.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_off000066fa.bin
d1f07c156f6dc09d233eece28fee33eb3847f5c45d9e54ddb27b64aa5a7e99a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66FA 5616 bytes
font_01_sfnt_off000079e3.bin
1d281593fa893ae8ea1283571ef7f5e219c5fb0f110f3896f3b805902e7e02ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E3 9900 bytes

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