Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce50c0389cdca37d…

MALICIOUS

PDF

74.8 KB Created: 2020-12-25 17:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d0d983878dea1fda0f8808edd4205bed SHA-1: a2d56b58e1cebeee156dc36bc754dcf8fd2b868b SHA-256: ce50c0389cdca37da57a6ceba1a397c768d0e1ae5120e572e67f4daa1fcc1d53
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?utm_term=bubble+letters+easy'. ML classification and ClamAV also flagged the file as malicious. While the document body is heavily obfuscated, the presence of a malicious URL strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=bubble+letters+easy In PDF document text
    • https://cdn.sqhk.co/dumadomizore/ihieheA/blend_me_photo_editor_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/WVFmjjZ/other_name_for_green_beans.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/higVicF/boo_boo_kitty_f.pdfIn PDF document text
    • https://cdn.sqhk.co/loboremetoxe/f2haigD/34713108317.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/eVhiuhj/47443863983.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/rivid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_5fada23ac74a4.pdfIn PDF document text
    • https://fegibaja.weebly.com/uploads/1/3/4/3/134305779/dufafevowebovus.pdfIn PDF document text
    • https://cdn.sqhk.co/bivadudit/ThcgkMF/sujobugojiwedogew.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/b12182b2-2370-487d-a9b8-1c821fb537ff/53785318236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03214d4-cc84-4906-a2b9-dffb9b22617e/bejabijem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e6be39f-4acc-49a7-90f2-eb5d1a62b5c8/61477463846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c900980-0209-4d00-8578-2ec567927dbd/texas_state_park_rv_camping_fees.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_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 4972 bytes
SHA-256: 731ac1b73036a98be587d8c1776ea4faade600725a3de96f8c1dd4fc443ee788
font_01_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 11084 bytes
SHA-256: a71df1c3c9416dd8b2b61c0dbc515f9352fc7ce282d168da4583d4a341c9baf7

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