Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed8530d7449debe…

MALICIOUS

PDF

51.7 KB Created: 2020-08-04 16:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b698567a2fca6929cc6ff33cdec721a4 SHA-1: 80d75524b764e57da461c16362ff3abb2be7a090 SHA-256: bed8530d7449debe7f97a0831ccb939a5ca9fafc37f184db29ff2c804520a7ce
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with multiple links pointing to potentially malicious redirectors like 'ttraff.cc'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=hydraulic+accumulator+calculations+pdf', suggesting a lure for users searching for technical documents. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates a distribution or phishing attempt.

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=hydraulic+accumulator+calculations+pdf
    • http://files.kscoastie.net/uploads/1/3/2/7/132712514/debuzu.pdf
    • http://files.milledlogs.com/uploads/1/3/1/4/131482950/4023771.pdf
    • http://getajenej.dennisandkaterina.com/uploads/1/3/0/7/130739227/remow_gitesuxitus_valugijut_xonilelunokiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/4735/2480/files/86329396008.pdf
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/garth_brooks_discography_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/zetoveredodijubenutizunis.pdf
    • https://cdn.shopify.com/s/files/1/0437/5855/1189/files/callback_function_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/english_reading_comprehension_test_b1.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5923/files/93695051863.pdf
    • https://cdn.shopify.com/s/files/1/0432/4543/7083/files/jatixofijemotazonus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/32824067844.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/laxigitifudavizemitipa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.pdf
    • https://cdn.shopify.com/s/files/1/0435/5388/2280/files/chinese_zodiac_story.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_off00008cd1.bin
603e7a776b72907363e13d3befddb84e39e7510f0062b84d82d29f13e53589dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD1 5364 bytes
font_01_sfnt_off00009f00.bin
ffa9ba4985a186b790c12dff57e721adb613d8ba0784c65bb083e7d476d800ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F00 10044 bytes

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