Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7f75c374d70cf7…

MALICIOUS

PDF

59.3 KB Created: 2020-08-21 16:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a52184f27dd8c6de5da677ce6552c369 SHA-1: 138be9ea5ccddcfd94a088195b54da6e01651d71 SHA-256: ea7f75c374d70cf71c2ced19a38aa58e021840d663ab7855dfb422cbf017856f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary malicious redirector URL identified. The document body, though heavily obfuscated, contains text referencing 'Cox digital cable tv guide' and the malicious URL, suggesting a lure. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the link leads to known malicious infrastructure. The ML_NYX_PDF_MALICIOUS score further supports the malicious classification.

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=cox+digital+cable+tv+guide
    • http://files.dragofficial.com/uploads/1/3/0/8/130874566/binededepiru.pdf
    • http://files.dobetterwhatyoudobest.com/uploads/1/3/0/9/130969999/405647.pdf
    • http://files.helenernstlongarmquilting.com/uploads/1/3/1/1/131164520/f2fa4c1de3.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/66861203959.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/68485035976.pdf
    • https://cdn.shopify.com/s/files/1/0430/9021/5073/files/hsk_3_standard_course_workbook_reading_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/8934/7228/files/xbox_one_running_slow.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5680/files/95129576157.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/39703846116.pdf
    • https://cdn.shopify.com/s/files/1/0450/3525/8020/files/movie_taken_3_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/livarafe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7790/files/filemaker_pro_free_for_windows_10.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_off0000ab87.bin
94ca77d73cf381c8a7943821fc9246a13bcb2fef311e9ce99e3b159e468141f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB87 5004 bytes
font_01_sfnt_off0000bcaf.bin
4d577b25d0574af23e40c945b05e2fca203c188a08647e524e90dc7f4f157049		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAF 10420 bytes

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