Malicious PDF — malware analysis report

Static analysis result for SHA-256 f211e0deebffe0b9…

MALICIOUS

PDF

76.9 KB Created: 2020-09-14 05:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01f0f6aa4ff2f0b59133a7dadefa1ca5 SHA-1: a299e467da6bccc266d4b801358335905280d657 SHA-256: f211e0deebffe0b9001bb45b0bdea11e99a2cf0ac13be6555b4aec74b226b0f0
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=speed+problems+worksheet+1+answer+key'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same redirector URL, suggesting a social engineering lure to a potentially malicious site.

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=speed+problems+worksheet+1+answer+key
    • https://static.u
    • https://static.usrfiles.com/ugd/738632_ffb9c7156ff44eb99fe5ddb25fff6cd8.pdf
    • https://static.usrfiles.com/ugd/f1780b_ef41bbfb59e340bc8ff44c5c4514193f.pdf
    • https://static.usrfiles.com/ugd/3eb4bd_d522ffcf7b0942d9ba9c5e2c89cf3cce.pdf
    • https://static.usrfiles.com/ugd/e23fbb_b533c4dd775542b29d747691c1d7c1b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_38c043821084448fb437f6f658a03275.pdf
    • https://static.usrfiles.com/ugd/d99ef3_eb11f9d53566458987875c6c57cd59f7.pdf
    • https://static.usrfiles.com/ugd/a3b54b_713dc2f1035e4fadb71b8065c2d724c1.pdf
    • https://static.usrfiles.com/ugd/cec570_b44e7e2da0834517a6c7ae50e2138d42.pdf
    • https://static.usrfiles.com/ugd/6c98bc_3c1c43878dd14d4d97cb4e0558f0ba46.pdf
    • https://static.usrfiles.com/ugd/a32c20_1fb2946d92df4a0da4db0b9517ab95a4.pdf
    • https://static.usrfiles.com/ugd/4dd980_b015322096b64b7a8bd1f641dd6bb624.pdf
    • https://static.usrfiles.com/ugd/1e32c2_54969fc310cc4ebd859996d702a2f789.pdf
    • https://static.usrfiles.com/ugd/a891c0_c42665c80c1b452e8cb0ad9e128e9aeb.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_8426150294b04d02a97ce0fa92643d1e.pdf
    • https://static.usrfiles.com/ugd/b7306e_b6bb6cfef9b14706baa2a03755575d90.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0de.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 2828 bytes
font_01_sfnt_off0000dad8.bin
adbdda67197339eef2f4fc8ba09a0393ba411e5265d17594116315948bd46254		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 5492 bytes
font_02_sfnt_off0000ed69.bin
57f988bfb9b1089f885a03789c7488c573e4d25c5c77dcfee201077dc063baa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 12664 bytes
font_03_sfnt_off00011597.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 4324 bytes

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