Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1b4db13b4c57ee…

MALICIOUS

PDF

84.0 KB Created: 2020-12-18 06:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f68a0f77be80f832dd676fe5924cc74c SHA-1: 50e67d9f3527a1f930ce8a2118b54cdeb7770973 SHA-256: 8d1b4db13b4c57ee7c90b03dd94a4f03b0257ce317c3b71e83be2ebac81c265d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://cctraff.ru/strik?utm_term=glittering+vices+free+pdf', is presented as a free PDF download, which is a common social engineering tactic. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/strik?utm_term=glittering+vices+free+pdf
    • https://portalspdf.com/1587432323
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d267286c-b214-4a98-8e69-149417bbfebb/denatured_alcohol_uses_in_perfume.pdf
    • https://static1.squarespace.com/static/5fc00570a3bf4b14aba44e61/t/5fc3d6d54e98326c0286d721/1606670038290/the_case_of_the_sleepy_slayer.pdf
    • https://s3.amazonaws.com/fadedosi/48636386910.pdf
    • https://uploads.strikinglycdn.com/files/ef91ff29-4a0d-4227-ab85-295bce4e359a/rozagegotigamonemom.pdf
    • https://uploads.strikinglycdn.com/files/329cfea3-84c4-47b5-b0a3-e36f152dc974/what_is_a_hero_worksheet.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/pulsar_chronograph_100m_manual.pdf
    • https://uploads.strikinglycdn.com/files/756deb35-37ef-4505-9e45-366e3f6d9034/bobcat_843_repair_manual.pdf
    • https://uploads.strikinglycdn.com/files/89d0ccd7-a990-4c41-88ae-c6103bcca39e/bezigigiwokulexim.pdf
    • https://s3.amazonaws.com/kibavutibeved/18442169387.pdf
    • https://s3.amazonaws.com/taturi/xeseruxabo.pdf
    • https://uploads.strikinglycdn.com/files/b380486c-3596-4b43-80ae-2a46d5b04e69/paper_mario_bowser_jr.pdf
    • https://s3.amazonaws.com/fupanabivote/column_chromatography.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_off00010b84.bin
d581efcfa2496a109247ded43533501e594e91af11a18395d6415f99742f320d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B84 5204 bytes
font_01_sfnt_off00011d59.bin
32c0490760f7514efae05e91d116564e0f3d9ba2e6248a5fa415e7a1e7803678
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 11240 bytes