Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac7a0c9038fa86e…

MALICIOUS

PDF

39.6 KB Created: 2020-11-02 13:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceafaf0aba8e6ce823e7414910a4f2a5 SHA-1: 59069dd7c5064690c18816fe5d85001c2b0d92f4 SHA-256: 9ac7a0c9038fa86e7630944494188f84b8fbfb2d584943ad67f993a02f7f12f9
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, contains text suggesting a lure related to downloading a book, which is a common social engineering tactic. The ML classifier also strongly flagged this PDF as malicious.

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.
  • 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://cctraff.ru/123?keyword=tuesdays+with+morrie+pdf+download
    • https://cdn-cms.f-static.net/uploads/4393647/normal_5f92dfdd47bb9.pdf
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/zuvekazabuz-topofelo-gupolekodojavo-ponabiloxe.pdf
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/nutokivapunatu.pdf
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/2085477.pdf
    • https://cdn-cms.f-static.net/uploads/4402706/normal_5f912651060c6.pdf
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f8743204773e.pdf
    • https://fegixobipe.weebly.com/uploads/1/3/4/4/134467450/80737f2be45d.pdf
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/xepiw.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5f9b8f26dd974.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sukobogixe/xulakivumaguleremelepobew.pdf
    • https://cdn.shopify.com/s/files/1/0501/3864/4645/files/73187417661.pdf
    • https://cdn.shopify.com/s/files/1/0502/8891/8724/files/55049024741.pdf
    • https://s3.amazonaws.com/golepe/baptism_certificate_template_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0502/7128/9512/files/yamaha_dgx_230_keyboard_review.pdf
    • https://cdn.shopify.com/s/files/1/0502/8675/6037/files/zoziv.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_off00005cb2.bin
95d6a048d5f5d7d319af7fdbd3524f94a11bfb10a464b195582c56f6563bfe36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB2 5424 bytes
font_01_sfnt_off00006f0d.bin
b2b921b6864cfcbb6819f4060b3fed716639c0c8611fcecb243c12c04b6c7d95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0D 9960 bytes

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