Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd6c7820ef0ecc9…

MALICIOUS

PDF

37.2 KB Created: 2020-08-25 15:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e1678daf23ec1e3b4ea1dd5af399bf6 SHA-1: 9022414950bb43591e8ba2bd5e09713d575ae90d SHA-256: cdd6c7820ef0ecc907db99903e62bdf1a34e8497b7bb5f01e4b52e0eaca45555
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector, indicating a phishing or scam attempt. The primary malicious URL, https://ttraff.ru/pify?keyword=corpus+linguistics+books+pdf, is designed to lure users by mimicking a search result. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded links further supports this assessment.

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/pify?keyword=corpus+linguistics+books+pdf
    • http://files.classroomacademy.org/uploads/1/3/0/8/130874266/9244340.pdf
    • http://watifob.thomaslhiegel.com/uploads/1/3/1/4/131437423/jofotijixa.pdf
    • http://files.shoptaylorwick.com/uploads/1/3/0/9/130969674/5923115.pdf
    • http://files.chamedicals.com/uploads/1/3/2/8/132815924/buxazu.pdf
    • http://tuwobugu.cs.ogdcl-nthp.com/uploads/1/3/1/6/131606066/b728b1eb1687951.pdf
    • https://cdn.shopify.com/s/files/1/0434/9889/7574/files/html_to_c_itextsharp.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3624/files/canceleria_de_madera.pdf
    • https://cdn.shopify.com/s/files/1/0438/8788/6488/files/vascular_dementia_journal.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/histogram_equalization_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6112/files/annexation_of_crimea.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/96713008998.pdf
    • https://cdn.shopify.com/s/files/1/0437/4691/8551/files/principles_of_teeth_arrangement.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_off00005324.bin
dba2440d63cdd4c6a55560fedb25fa32510077ce6abd9aa11381209da071e5c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5324 5220 bytes
font_01_sfnt_off000064f1.bin
20348e8263d45ccaf9be1e4456fcd0574d4cf11fe757f7cf9bbf0fca84674d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F1 10472 bytes

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