Malicious PDF — malware analysis report

Static analysis result for SHA-256 957aca1ee78359a6…

MALICIOUS

PDF

50.3 KB Created: 2020-11-02 08:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7ffdb3c27cdad535a3c439ccc9f56507 SHA-1: da7b45ac35b20e30b42bc7e88de3d897cda1fe6f SHA-256: 957aca1ee78359a63124b0da6fa4d2024c3d0b5ece4272d117cab3f9f4865188
102 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL that the heuristic flagged. The ML classifier also strongly indicated maliciousness. The presence of a download button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=partial+pressures+of+gases+pogil+answer+key In PDF document text
    • https://lozatovetifeg.weebly.com/uploads/1/3/3/9/133999134/ce813f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fasanag/bubble_graphic_organizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1fb8df-ca6a-4c17-8f7f-1411852a92c5/sogokajuzuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ceeaa5-0161-44d7-8540-c02df88c93af/23949923079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d41b7b-e9b5-4654-b85c-ac072c7f7bd5/63223550269.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/65653488346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e53cdb6-c12e-47ad-a19f-5af7fcdb8067/bixekedujafagerale.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/pathophysiology_of_cataract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9223bf21-d456-403f-8657-7d48af4d3f06/rojodomatuxewixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ab521e-3be3-4c99-8294-04755595d3f8/8017705858.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/building_materials_civil_engineering.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000631a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x631A 5328 bytes
SHA-256: 3b4398c4746b4f5bad669902e25d656431a123688d9b7899f9118d08d2a353df
font_01_sfnt_off00007567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7567 16496 bytes
SHA-256: cd2f1e9c47899f504598540735c4c60543dc31dad1e557df6aa408d8bf7523de
font_02_sfnt_off0000a583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA583 16448 bytes
SHA-256: 4972c892cf783310df7ebe7a43044f7b4e4d650808add06809858f2f0e6eeb09

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