Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbec5e46d680cb1…

MALICIOUS

PDF

71.3 KB Created: 2020-11-10 23:17:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 66b850d0352d048795ad1cf496d8387e SHA-1: 3186f69411d0afac978bf8cb82aefd689f031839 SHA-256: 4dbec5e46d680cb1017876a7bbd8001e0288df55a60513016d1bf09bb3f6eef1
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL 'https://ggtraff.ru/strik?keyword=restate+answer+cite+explain+pdf' is the primary indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and the malicious URL suggest an attempt to lure the user to a harmful site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?keyword=restate+answer+cite+explain+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f9c665bdc895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_5faa189481f67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f9968ff26e3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f872f4c5d17b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_5fa6e4894021d.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/ffcd6450-e938-4260-a1dc-57de696f9463/dymatize_project_mass_trainer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927bb1fd-2212-473c-b288-36072c3feae9/busefaxotasefenor.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/thinking_out_loud_lyrics_drake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0355959d-3ca3-4eee-9c55-159558c165ed/sd_card_recovery_apps_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/microcontroller_based_data_acquisition_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c25a8a-b185-48ff-90b5-cbd1dab14100/8815698902.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/accentuate_the_negative_unit_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0734bfb5-62a8-45f8-9fed-7037fae3ce1c/jududunitam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/794db043-7951-4d82-8ce2-6cb20fcc201c/fefuwikigopabe.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_off0000c536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC536 5316 bytes
SHA-256: 7247465324fd66e10f37617a5ca99a66a836d4b31b67331aca889f9ed6517eb0
font_01_sfnt_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 10136 bytes
SHA-256: f5dfdd06bc1a0f26fa315fa5d3bd6ca1900fe58bb0665f57fa99f31a981eae8e
font_02_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 16620 bytes
SHA-256: 122c476b1ce5365864b18f25bbf652b52f224c38d3d8f790e41bd956a4599d57

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