Malicious PDF — malware analysis report

Static analysis result for SHA-256 66651fb19ef6b192…

MALICIOUS

PDF

362.6 KB Created: 2020-08-22 06:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 627acbbc127752192141ab784f7604df SHA-1: f2cb08940e8fe595cdf1eeaaa0f795bee73b4093 SHA-256: 66651fb19ef6b192e51c94962983c1f6db8326459679b45f6ffc27ffe2d57b05
94 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF as malicious with a high probability. The document body, though heavily obfuscated, contains a URL that appears to be part of the lure, suggesting an attempt to trick the user into visiting a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=xanathar%2527+s+guide+to+everything+fighter+subclasses
    • http://files.londonhalleditions.com/uploads/1/3/0/9/130969710/25141cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/bums_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/3644/6613/files/73985535556.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3346/files/southwest_airlines_confirmation.pdf
    • https://cdn.shopify.com/s/files/1/0430/2284/4067/files/70722124461.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/laramifijusubid.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7427/files/fenudupipexilifaliv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/4653522620.pdf
    • https://cdn.shopify.com/s/files/1/0446/7530/1539/files/reading_aloud_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/9605/4690/files/jeralevi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0751/6565/files/19182104381.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000552ba.bin
a9956e0ec8bcab239d4896898c14920111397b64d2538e250131b63e4be08f59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x552BA 5596 bytes
font_01_sfnt_off000565c2.bin
c90e89faabcbe17271dcc032335c8026e18d6fd4669c684a036bbea9da642db3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x565C2 17024 bytes

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