Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf921cff902ab1c…

MALICIOUS

PDF

46.1 KB Created: 2020-10-14 18:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9ffb82cc8efcd55e3b4b4b02e11785a8 SHA-1: 27a67e2752bea1392d8de6a60b842f4e78ef3176 SHA-256: dcf921cff902ab1c76367529544cd2392fab6876d2e6a47d9585c9574cf9e597
102 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL found in the heuristic, suggesting a phishing or malware delivery attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient to infer a likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.ru/pify?keyword=cbse+net+2020+notification+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f870df130d01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f8715288cf99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f871a64d9452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8704db3b79d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f86f4eb46b0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f87091560788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f8712030baf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f86fe972c30e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f86f85a24e01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f870394c33cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f87033452bd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f870fcbf0863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8706e6c7cfb.pdfIn PDF document text
    • https://site-1040434.mozfiles.com/files/1040434/73495001585.pdfIn PDF document text
    • https://site-1044255.mozfiles.com/files/1044255/37398373003.pdfIn PDF document text
    • https://site-1040892.mozfiles.com/files/1040892/jolidikilefagefogubibaji.pdfIn PDF document text
    • https://site-1039349.mozfiles.com/files/1039349/17824465630.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f252242-16f2-4ca0-82b4-750e21c6bfcc/likiminefixerawuguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fca34ea-7727-4351-9751-92e282f46c2d/dojapunoroxemefel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecb2ae6-b463-41e1-a3b1-e0f5dfb7af00/4000351382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32dd0cef-362b-40da-ac0c-c04557a7e064/bipativotom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383e8cb2-6cbd-4ae0-b146-e2f70dd7f27f/36283317626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5f5977-af1f-43bf-9100-807af8c69c99/79846631199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1619811c-1ccd-4a4a-8260-000d8fa4099a/92083373039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e013561b-7270-4a9f-85b0-c480c69e129c/61660947188.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC2 5340 bytes
SHA-256: 07816ac2a6b7b752466934c79edb3065910935be55804af3ab4d66276bf760e2
font_01_sfnt_off00007df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF3 14480 bytes
SHA-256: 137af6a2004389949b1f87c00297fb21290fe22e56a2c5cebc1143a3084f32a9