Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c23be9beb3bc4f…

MALICIOUS

PDF

39.2 KB Created: 2020-08-30 02:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04c0cb74d9970b9c9bc47d021d004489 SHA-1: 3fab637b44cc43e3b90899f3c327f1f5d3f3cf0f SHA-256: b5c23be9beb3bc4f57947ff228f045a4c89c07506174141e001a47e6202ac5df
150 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.ru/wix?keyword=class+9-10+math+solution+pdf+bd'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of a large number of external PDF links further indicates a link farm designed to attract traffic. The ML classifier strongly supports the malicious nature of this PDF.

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=class+9-10+math+solution+pdf+bd
    • https://static.usrfiles.com/ugd/4b874d_d7c3711c1e3846b3913a26a36a92288c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ddb8706259343fda196a32fad2e67d7.pdf
    • https://static.usrfiles.com/ugd/93c935_9861b10577fd4cec8acd87f6b8adb179.pdf
    • https://static.usrfiles.com/ugd/07e02c_4c0265ba434d4364aaaa2aea940d3839.pdf
    • https://static.usrfiles.com/ugd/38bf1f_e348198c5ff542d29b8fe9e60e030831.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/clicker_heroes_redeem_codes_2016.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/google_analytics_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/3233/0908/files/felajelenozisenoxaxotosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2931eb0f4b647fc8cead60f5e2cafda.pdf
    • https://static.usrfiles.com/ugd/ca300b_fdffc59651504d4fa1293e91ca2ae5f0.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/wika_ls-_10_manual.pdf
    • https://cdn.shopify.com/s/files/1/0443/8809/0022/files/deziw.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4657/files/44111026100.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/98170182543.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_off00005a4d.bin
d77a56882462dce87b76d492b0790d8882bc4c05283508812c1ca606de65c584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4D 5612 bytes
font_01_sfnt_off00006d40.bin
caee589c33f69778feeafb16b3e14b5b796c66a02dd8721c15afef6ce89c6a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D40 10180 bytes

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