Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5b89afa69e87dc…

MALICIOUS

PDF

39.8 KB Created: 2020-09-12 19:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9439af26d4fea1c3a72613d79a350ae SHA-1: 3529b94ac433cd76a28cd45dd3d1d7efaf394b73 SHA-256: df5b89afa69e87dc9f12648da21483358667ef93aaa8e0fcb67ed5227ac2216a
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign content, but one prominent link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL. This suggests a phishing or redirection attack aimed at users searching for specific local school information. No scripts were extracted, limiting further analysis of payload delivery.

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.me/wix?keyword=hill+country+middle+school+austin+tx
    • http://files.bec1.org/uploads/1/3/2/6/132681409/171f10a41ddd.pdf
    • http://files.bluestarunion.com/uploads/1/3/0/9/130969580/ruvuzun.pdf
    • https://static.usrfiles.com/ugd/6a4619_f9aea857b5db47bdb6c853d69afce9db.pdf
    • https://static.usrfiles.com/ugd/0cd019_0177174bf2484a81a1861bdc8cc94e68.pdf
    • https://static.usrfiles.com/ugd/d55797_6705ed68e365468c8d745d0bd5df8a83.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/78294798149.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/36131611795.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/21384809733.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/59529222058.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/57182382832.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/potusunuguko.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_off00005812.bin
3f9bb4ada045e9ee74d837a2c490884f6735837dc68c59f00b1fca7e99a94c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5812 5312 bytes
font_01_sfnt_off000069fa.bin
7d3b1431ba297fdc8cb7a2bcce24918dc18629d79208d2ca627f634ccc311fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FA 12520 bytes

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