Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec556c10b9f2696…

MALICIOUS

PDF

77.9 KB Created: 2020-11-09 19:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 909a908fd3057a16f2b63c552e412bae SHA-1: d40aa3a2997d22916759cc7a9019f34577b32e14 SHA-256: fec556c10b9f2696b78c170ec43f744d89ee128bf1351a02c245364640bbe44d
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/123?keyword=free+classroom+timers+for+kids'. This URL is the primary indicator of malicious intent. The ML classifier also strongly flagged the PDF as malicious. While no scripts were explicitly extracted, the PDF structure and the malicious URL suggest an attempt to redirect the user to a phishing or malware-hosting site.

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://cctraff.ru/123?keyword=free+classroom+timers+for+kids
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f90c74a8de29.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/donake/relowosegodakapa.pdf
    • https://uploads.strikinglycdn.com/files/0de89cc0-0068-438a-97d9-744fbf9acaea/84574342604.pdf
    • https://s3.amazonaws.com/vavale/campaign_finance_worksheet.pdf
    • https://s3.amazonaws.com/vuforewebub/87133033211.pdf
    • https://uploads.strikinglycdn.com/files/d2393213-9bd0-4ac6-b695-addb6844b72d/78966298874.pdf
    • https://s3.amazonaws.com/wazorixekunafob/dumuvetiful.pdf
    • https://uploads.strikinglycdn.com/files/cf08fbeb-ec2d-479c-9521-3136b7c3a995/pulorumuvi.pdf
    • https://s3.amazonaws.com/zomuzigo/ayatul_kursi_download.pdf
    • https://s3.amazonaws.com/tuxenipup/a_practical_guide_to_dragons.pdf
    • https://s3.amazonaws.com/pazifetanegapu/15604429344.pdf
    • https://uploads.strikinglycdn.com/files/190f0b74-0fe4-4e35-a1b7-96dbc300b029/diva_goddess_queen_free.pdf
    • https://s3.amazonaws.com/zuxadol/pdf_split_and_merge_download_free_windows_7.pdf
    • https://s3.amazonaws.com/widofafane/summoners_war_ophilia_defense.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_off0000e6e9.bin
64ae32a2a0b2441b155d9d8948a2b712c9b931c44bfaea95a3d5a6f3f0a023a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 4868 bytes
font_01_sfnt_off0000f771.bin
7ab231f421cf30e783811d5e87ac12daad1434b745a29ed78091547ec8d69301
pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 10836 bytes
font_02_sfnt_off00011c36.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 4324 bytes