Malicious PDF — malware analysis report

Static analysis result for SHA-256 1118a537c265c4ca…

MALICIOUS

PDF

75.8 KB Created: 2020-12-17 02:12:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0008af46aac15a7054dd815cdbb995da SHA-1: d51e2a53bee4342d47361ccd75315c84c9e2d887 SHA-256: 1118a537c265c4cacbe99ba7a1f1bd68258066fdd01f1b5b6849e9763c66bdb2
154 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded URL that points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the primary malicious finding is the redirection to the URL.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=maryland+2018+football+media+guide
    • https://cdn-cms.f-static.net/uploads/4426267/normal_5f99d24867e81.pdf
    • https://cdn-cms.f-static.net/uploads/4530937/normal_5fc2979fa313d.pdf
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5fc9ec153ccb1.pdf
    • https://cdn-cms.f-static.net/uploads/4424349/normal_5fbf5f4b04e45.pdf
    • https://cdn-cms.f-static.net/uploads/4412413/normal_5fc09f26760ce.pdf
    • https://cdn-cms.f-static.net/uploads/4480155/normal_5fae39ae77688.pdf
    • https://cdn-cms.f-static.net/uploads/4415527/normal_5f98eeb286d9f.pdf
    • https://cdn-cms.f-static.net/uploads/4383913/normal_5fab360259dfe.pdf
    • https://cdn-cms.f-static.net/uploads/4450240/normal_5fd3afbe90660.pdf
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f871e45dfa4b.pdf
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f889178c7b46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jiguwuzobozobaz/scn_molecular_geometry.pdf
    • https://s3.amazonaws.com/buponuwebi/63764818651.pdf
    • https://s3.amazonaws.com/bubisifapagefe/46995232399.pdf
    • https://s3.amazonaws.com/retisovojor/xufenukogefirafewibirij.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_off0000da92.bin
37a85c2d41c9fd16e392bd42a5adc7d987618baf7ecab49b460d3f46ed92e55c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 5700 bytes
font_01_sfnt_off0000edea.bin
92026412cc253bf20ed4a45b60e2a66601f41d5ee3a861b83c5d47f57539d46c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 11208 bytes
font_02_sfnt_off00011423.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 4324 bytes