Malicious PDF — malware analysis report

Static analysis result for SHA-256 87df9b603d51ce4d…

MALICIOUS

PDF

71.7 KB Created: 2020-12-24 13:14:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b6eda2c58f0f8b0d29626d6fddc9898 SHA-1: 7405d0bf0cb9bd8b8148979226cafcccb8f64b69 SHA-256: 87df9b603d51ce4d1bad84e3cfe5628a82c95c09a983d33bc4f5ce1f6328563b
222 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for downloading software, supported by a 'download button' heuristic. The presence of numerous external links, many pointing to PDF files, suggests a link farm used for SEO poisoning or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/strik?utm_term=car+simulator+2+mod+apk+download+android
    • https://static.s123-cdn-static.com/uploads/4448976/normal_5fc6f3a297476.pdf
    • https://cdn-cms.f-static.net/uploads/4501204/normal_5fbe5116a5484.pdf
    • https://static.s123-cdn-static.com/uploads/4413851/normal_5fc444e4a89b8.pdf
    • https://ziwuwozapa.weebly.com/uploads/1/3/4/5/134517717/9917140.pdf
    • https://cdn.sqhk.co/gozolosew/XlEmTha/vortex_cloud_gaming_apk_download_free.pdf
    • https://cdn-cms.f-static.net/uploads/4411717/normal_5fd0f72d6a008.pdf
    • https://cdn-cms.f-static.net/uploads/4418788/normal_5fc34f5967d89.pdf
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fa1112e0cb76.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/971727e7-8aea-4cae-90e7-c472f04496dc/plato_symposium_full_text.pdf
    • https://uploads.strikinglycdn.com/files/83b49657-400a-45c0-9e19-5b8d41c3f05a/daraki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf4.bin
9d50cdd5c5d636c640f74b64ff1b572394a3faff320c78610d01af4117b57d7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 5180 bytes
font_01_sfnt_off0000df8c.bin
6c5b77ac6cfde0d4f8d023eb8675f803a3aa79799106c86a7a715665b3ccff5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 10576 bytes
font_02_sfnt_off000103b9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 4324 bytes

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