Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a51ad820f5cf90…

MALICIOUS

PDF

67.1 KB Created: 2020-12-17 04:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a708af8ba27583a320ef6477e49d4a5 SHA-1: 16c220093d2bc2a528245a8dad05dcb5136cef6a SHA-256: 83a51ad820f5cf90cc237ec512475cea85aa56815c22c8c82648317db0567802
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The embedded URL likely serves as a lure for phishing or malware delivery, disguised as a discount code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/strik?utm_term=melanie+casey+jewelry+discount+code
    • https://static.s123-cdn-static.com/uploads/4377388/normal_5fc6771a60244.pdf
    • https://cdn-cms.f-static.net/uploads/4428342/normal_5fb2b84dcf0f0.pdf
    • https://cdn-cms.f-static.net/uploads/4482426/normal_5fd6d0dd3c8ee.pdf
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fc487d6abe13.pdf
    • https://cdn-cms.f-static.net/uploads/4478664/normal_5fafa6c675dc0.pdf
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/sikabibetev.pdf
    • https://static.s123-cdn-static.com/uploads/4417536/normal_5fcc18a8bc180.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bb441d2f-12f3-43f3-972e-c9c799fcaf3a/11526536840.pdf
    • https://static1.squarespace.com/static/5fc5c92c11f6a41984a72880/t/5fd158649a9e5443ac6b0794/1607555173141/dizonovudozuwugopomipixi.pdf
    • https://uploads.strikinglycdn.com/files/797a2c3d-9a06-43c2-bc0f-88311507cd18/brian_tracy_eat_that_frog.pdf
    • https://s3.amazonaws.com/xanunafojuloki/ligepozab.pdf
    • https://s3.amazonaws.com/pazatuv/kavaripixakoz.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_off0000bb6a.bin
ff98a34c4b4f2b6e541895985816babcad6f6ca14c843cf2e155c69de615252c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6A 5092 bytes
font_01_sfnt_off0000ccd1.bin
6e55fc8cc23ce2a5d21cb9000092777302d057d976bf7c6a92d947e375ec9587
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 10704 bytes
font_02_sfnt_off0000f167.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 4324 bytes