Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bbba0b29cf0a0a…

MALICIOUS

PDF

41.2 KB Created: 2020-08-30 07:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8ef75908804a93139276bcd66819279 SHA-1: ffc4e57489dc45e8fc5fe3a0e174dcdabe01e0cb SHA-256: 90bbba0b29cf0a0ad61b65ce8845d720d418c88dd68d8aef366e0526fe54e0ac
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=drawing+for+beginners+with+oil+pastel'. This URL is likely part of a phishing or malware distribution chain. The file also exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, many hosted on 'static.usrfiles.com'. The ML classifier strongly flags this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

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.cc/wix?keyword=drawing+for+beginners+with+oil+pastel
    • https://static.usrfiles.com/ugd/b8c837_4435acaf8f07454098913d9b1539bec5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9204ac282bf45bc993e2c3fc17378d7.pdf
    • https://static.usrfiles.com/ugd/735189_75c76eed633a426e85783e27bafc506e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9f211a98cea43578793083a7e7d4c46.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ce93d7e56684d80976aec5ef8e902b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c99193cc0183462995fb5114baa79c59.pdf
    • https://static.usrfiles.com/ugd/67e251_c7bf0b8288ba49c68d07689e5263476f.pdf
    • https://cdn.shopify.com/s/files/1/0436/8970/5625/files/xuwaleponimodulavofev.pdf
    • https://cdn.shopify.com/s/files/1/0438/1956/5216/files/ralafupolopaladinosibem.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3434/files/94216142597.pdf
    • https://cdn.shopify.com/s/files/1/0431/1764/1879/files/53111269025.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/pdf_to_word_converter_free_download_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/1103/8632/files/91386076515.pdf
    • https://cdn.shopify.com/s/files/1/0431/0958/0961/files/google_chrome_32_bit_windows_7.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_off000061c4.bin
d18c2f38348fcb6bfbe4c4cfb87800e6321dfc18e7acc2d13bb89ee8620f7fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C4 5396 bytes
font_01_sfnt_off00007427.bin
0a8b38a5f614f87fffe460ef81907b4f7ba5a6dc1ae81ccadf50ffac5ac4e778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7427 10536 bytes

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