Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3729bbf564d12e…

MALICIOUS

PDF

45.9 KB Created: 2020-07-25 10:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8e151780bdc077ecf8c96886ae7d9b0 SHA-1: 5cb5531fdd5fe2fe3a3dda443cba15783841a95a SHA-256: 4f3729bbf564d12e196ff4aa387437a08ade5392468bf2dc568abd0a916286c9
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.com. This indicates a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.com/pify?keyword=roboto+font+softonic
    • http://files.levental-lab.com/uploads/1/3/0/9/130969254/pupuvavofufo_vusoxexolubovi.pdf
    • http://files.douglascountyyouthorchestra.org/uploads/1/3/1/6/131607321/3575136.pdf
    • http://files.evergreenforestptsa.org/uploads/1/3/1/4/131453250/4cfe32.pdf
    • http://files.cristiansulea.com/uploads/1/3/0/7/130775970/ad9db0c45.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/jubusafodis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9966/8121/files/91144289008.pdf
    • https://cdn.shopify.com/s/files/1/0435/5211/2803/files/nidutobirajetijen.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7897/files/19644533339.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27055139941.pdf
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/biguj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/98710053080.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/65947976213.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/tilajemirazeni.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/poniweviwolifasorox.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/tigir.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/90147354682.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_off0000755f.bin
b6c637da4a8a4ebe16058c901df6aa7d71c2a10c0b463385d8778046658033ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755F 4352 bytes
font_01_sfnt_off00008438.bin
4f9dd706fe8ec8d3cbc038561d2131fbd1fbf6dd1ee786ce352731df5681b913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8438 11472 bytes

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