Malicious PDF — malware analysis report

Static analysis result for SHA-256 6764e740bb4a4a82…

MALICIOUS

PDF

46.8 KB Created: 2020-10-29 14:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3010741d6f2c3daf37bd9606657a3b1b SHA-1: 9ec869a90fa4a641efc77fd40a56ba62aa8253f0 SHA-256: 6764e740bb4a4a82d50a83ad2481bcb68f5333a9fdc682e9f2c9472cd2b0e0d8
94 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to appliance manuals. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL.

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=kitchenaid+dishwasher+parts+manual
    • https://cdn-cms.f-static.net/uploads/4406466/normal_5f94c5e510c46.pdf
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5f91b84caa7ef.pdf
    • https://cdn-cms.f-static.net/uploads/4412570/normal_5f9a25130c549.pdf
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f882b74dbe5d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sugaguxagu/66718017116.pdf
    • https://s3.amazonaws.com/fasanag/temajifewuru.pdf
    • https://uploads.strikinglycdn.com/files/8abd5ab2-a55a-449a-abc1-8ea325df74a0/temas_gerektiren_ve_gerektirmeyen_ku.pdf
    • https://uploads.strikinglycdn.com/files/f32a3e3d-1410-436b-a8db-cb3d1e4565c3/zujigamaxuw.pdf
    • https://s3.amazonaws.com/zuxadol/9762570235.pdf
    • https://s3.amazonaws.com/bizamesuwepe/early_childhood_special_education.pdf
    • https://s3.amazonaws.com/tetofamuxulil/direct_material_price_variance_calculator.pdf
    • https://uploads.strikinglycdn.com/files/872a821c-a411-481d-86ae-cb1bbc8337cf/gapimobixebovakexapovosa.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/mcdougal_littell_us_history_guided_reading_answers.pdf
    • https://uploads.strikinglycdn.com/files/9623a88d-b8f7-4013-9b85-cf8070e8332b/lategogazi.pdf
    • https://uploads.strikinglycdn.com/files/8de76ba7-fc3a-49a5-b5b4-eb31959ba40c/bigazozinagubesom.pdf
    • https://uploads.strikinglycdn.com/files/3f20d0f9-5688-41a1-a543-d573cc5dda7f/49909765736.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_off0000775f.bin
50f92e45a9ad5ce3a23f686483f99b8b41538c4eff4e3cf40ee2f21ab3a5a7e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x775F 5376 bytes
font_01_sfnt_off00008993.bin
86acc79e7b7071f9b9ed71a3975540e0c0d3382a268a74d7c006f9eb54366f3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8993 10804 bytes