Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a18fe886e7de33…

MALICIOUS

PDF

46.8 KB Created: 2020-08-30 04:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b32a8e193b810d9b4d2654d388795b7a SHA-1: 3a5a375a4312fbe3ae25948be3513a590cc6b3d1 SHA-256: b4a18fe886e7de3351d266e130df21b8bd01f6dec5426960ccd2920f48cb06df
150 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector, ttraff.ru, which is designed to lure users into downloading free software. The document body, though heavily obfuscated, contains the same lure text and URLs. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to increase visibility of the 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=download+undertale+for+free
    • https://static.usrfiles.com/ugd/b8c837_9e555a8fb9454e799ab6494884fca9d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfddc23b676d495b92b6939aaaf8531f.pdf
    • https://static.usrfiles.com/ugd/36f25b_49d091ba9d004ef3b4b14928a30af4e7.pdf
    • https://static.usrfiles.com/ugd/0c41e7_58ceb1c091094574a4e92ab92572af1a.pdf
    • https://static.usrfiles.com/ugd/6cf392_d119be4965834a29aa955692f2c22924.pdf
    • https://static.usrfiles.com/ugd/b8c837_62739d95b2f248fca9c21bdb07cb5f2f.pdf
    • https://static.usrfiles.com/ugd/538d67_16faca99480d4f6b918ae26026179586.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab4ee2da73eb4312bf501c91e8755d75.pdf
    • https://static.usrfiles.com/ugd/6240f8_6fd51cafadee4ff3bbb594f2400635ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5b1d4ade9bb4405915c7c4c70ea93ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed34aca71a40419b9ec8ee211011c7d6.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/astronomy_textbook_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/8079/4780/files/risk_assessment_plan_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3556/files/aldehydes_and_ketones_class_12.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_off00007b6d.bin
a3a8b46834f6daa3053b6a2539c2839d26d73cd49fae4bb8e6773b63fcc27447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B6D 4816 bytes
font_01_sfnt_off00008bee.bin
eafa67f58380cd86fbb3e2bf1f7e094b527196c0ccc43ac17cf62854fba9032f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEE 10348 bytes

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