Malicious PDF — malware analysis report

Static analysis result for SHA-256 be88c9dcef921d91…

MALICIOUS

PDF

34.2 KB Created: 2020-10-03 20:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9a3d4e647e1e2ab0b4ee5da8c85cc75c SHA-1: d08b0dccf3f475bcda8c3cb87b9a8acae00f1697 SHA-256: be88c9dcef921d913e9903a193c03ea4a693f043cc576389019a132659cc925f
94 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/strik?keyword=the+crucible+multiple+choice+questio'. The document body and embedded artifacts are obfuscated, but the presence of this link strongly suggests a phishing or malware delivery attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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://gettraff.ru/strik?keyword=the+crucible+multiple+choice+questio In PDF document text
    • http://govekax.eraseair.net/uploads/1/3/1/8/131871405/de76d5.pdfIn PDF document text
    • http://jopitara.franklintonbaptist.org/uploads/1/3/0/7/130775411/jatavubolakuviwen.pdfIn PDF document text
    • http://files.alpinerec.org/uploads/1/3/1/4/131407324/pumamaxejutubura.pdfIn PDF document text
    • http://files.esibstudentsfront.com/uploads/1/3/1/4/131482919/niwasovuv_mafub_legokulavagid.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/48280417-1686-4b6b-a1d6-57a6cc742023/57898804120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf555ed7-2cb3-4dc2-8aad-39b1d1fd7e53/69339083024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b0d6d3-f2ca-413e-abf0-6ad6dea72fa4/72739950363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66d2c2e-5c19-4639-b4ed-6a1b9746f52a/gapidumafofupewojijovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ff160c-cd26-4c82-8d43-98991e363c9b/81154434126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00a122d-3c89-43e1-8e9d-c019cebbc6b4/22789615665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce34ab5-0de4-4546-ab49-8573f376e32d/mawezivisamoxofuxomod.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_off000048dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48DD 5176 bytes
SHA-256: 0f0f4d9ead8268af27e05351183d0def8b9472ad47a32c6023e65c614511f32f
font_01_sfnt_off00005a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4D 9928 bytes
SHA-256: 73ebd41a7ea6ab438d1962b19c36a438ee6ade5b952291d98dd82d494df431f1