Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf91faf4bc75cfe…

MALICIOUS

PDF

67.6 KB Created: 2020-11-07 23:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f504a56c12712420776f4b14bb07f2db SHA-1: 536facb4fce08d000f363e8831fdaef5fd1831c3 SHA-256: edf91faf4bc75cfe2e47e022e3fa60d23d09a0865882bfef9762f1fc0de0e999
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to known malicious redirector infrastructure, indicating an attempt to redirect the user to a harmful site. The heuristic firings suggest this PDF is part of a link farm designed to distribute malicious content. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ggtraff.ru/aws?keyword=end+of+ramadan+2019+usa
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5fa2c90d5f60a.pdf
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f8822977d8ec.pdf
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5f9fb954ba306.pdf
    • https://cdn-cms.f-static.net/uploads/4390659/normal_5fa0d982cac8b.pdf
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f97ecb95de68.pdf
    • https://cdn-cms.f-static.net/uploads/4368222/normal_5f89f3ed407e0.pdf
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f918467b6de0.pdf
    • https://cdn-cms.f-static.net/uploads/4420597/normal_5fa4739119f3c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kulunem.files.wordpress.com/2020/11/89547484469.pdf
    • https://rotadenig.files.wordpress.com/2020/11/82236523173.pdf
    • https://s3.amazonaws.com/remoxi/38449422665.pdf
    • https://s3.amazonaws.com/wilugugo/zakaxerilegamu.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e17e.bin
6bcb30206193511179c7d7ab265671cc2b0c281c5b38f7989660683afae5694b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 5096 bytes

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