Malicious PDF — malware analysis report

Static analysis result for SHA-256 9523e6c4cc7046e5…

MALICIOUS

PDF

67.6 KB Created: 2020-08-24 15:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b33b05aafd2717d07841b3b02661448c SHA-1: 78d1574346cb3f693921197090c67123a7284f49 SHA-256: 9523e6c4cc7046e586ea2d89c6d47095755a5bcec58e51a5ee1695462abf9e3b
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL identified as https://ttraff.cc/pify?keyword=esmo+consensus+guidelines+colorectal+cancer. This suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=esmo+consensus+guidelines+colorectal+cancer
    • http://files.anamarielewis.com/uploads/1/3/0/7/130776246/sebesoratom-piridi-nisibulujititud-jajefusivi.pdf
    • http://files.benjatos.com/uploads/1/3/1/6/131606046/zukemiruxapadaxitufo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0855/files/segifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/95509007145.pdf
    • https://cdn.shopify.com/s/files/1/0440/7263/2470/files/ahirani_new_song_2018.pdf
    • https://cdn.shopify.com/s/files/1/0439/4146/2174/files/useful_html_tags_and_their_attributes.pdf
    • https://cdn.shopify.com/s/files/1/0434/9512/9254/files/xezubojud.pdf
    • https://cdn.shopify.com/s/files/1/0428/6935/8758/files/14774963635.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/benchmarking_in_business.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/5932400428.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/xelumi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9740/files/68590258033.pdf
    • https://cdn.shopify.com/s/files/1/0437/1916/4058/files/53513305442.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_off0000c988.bin
8253e911b62e9a1213f3c77a9c95c54aa250fa2b35f29daf1544edd133f5a346		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 5216 bytes
font_01_sfnt_off0000db28.bin
000e1563a60c44acaf2e773c7006ca0951baf5b587da509566dc2e85761efe2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 11708 bytes

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