Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ba9cf1a447b2fe…

MALICIOUS

PDF

60.9 KB Created: 2020-11-10 11:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c440f65a0303a626540348dbb28f9237 SHA-1: d3790a48389e69262cc272018986547d629ca731 SHA-256: 55ba9cf1a447b2fe7a4ca3bbbec43c77abf025659cfbd5945dd447578ad926ff
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://gettraff.ru/aws?keyword=lumber+tycoon+2+spawn+axes+script'. This URL is likely used to redirect the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gettraff.ru/aws?keyword=lumber+tycoon+2+spawn+axes+script
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5f99f726f2943.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/vowibowafulora.pdf
    • https://cdn-cms.f-static.net/uploads/4413843/normal_5f9719b60511a.pdf
    • https://vuloribogisoso.weebly.com/uploads/1/3/4/6/134655424/pumoborefu.pdf
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/aab6c397fb94abe.pdf
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5f93427c27e34.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5ae5fe4d-8228-4589-a1d0-f352c6354650/30287298979.pdf
    • https://uploads.strikinglycdn.com/files/838edb19-a12c-459a-b3f6-52544ea13951/zuxozegixusitibov.pdf
    • https://s3.amazonaws.com/nepawigexa/69999831775.pdf
    • https://uploads.strikinglycdn.com/files/66aafdeb-8e46-4d13-9a37-01aa42172e11/fuwilemeji.pdf
    • https://uploads.strikinglycdn.com/files/7ff4e72b-915d-466d-bbe4-e0905c11eb79/sagowafemiweg.pdf
    • https://uploads.strikinglycdn.com/files/a32e4294-5373-41d7-b54b-44d3d75dc66b/7204162669.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_off0000b0da.bin
c5548704ad782263f48cda6e8ca966b91feb2f18daa6542e29b65539dfbb7d42
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DA 5520 bytes
font_01_sfnt_off0000c3aa.bin
ca61807cf599adcb52cffc254528b5596c99a766abfffcdad4b7d04a35c969e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AA 10300 bytes