Malicious PDF — malware analysis report

Static analysis result for SHA-256 151525daaa7ca92b…

MALICIOUS

PDF

70.0 KB Created: 2020-11-20 16:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb81fc7a0098ed049d7b86389c9b85d5 SHA-1: 1f172d74c3172762f0ff30d9aedb82bc498a1644 SHA-256: 151525daaa7ca92b5794e4d67784f6244ee59b3fbb6d7860081cb8cbedeeefc3
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 'ggtraff.ru', which is also listed as an embedded URL. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of a malicious URL within a document that claims to be a free PDF suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=essentials+of+sociology+pdf+free
    • https://cdn-cms.f-static.net/uploads/4415073/normal_5fa95d49bf155.pdf
    • https://cdn-cms.f-static.net/uploads/4477658/normal_5fb512246c525.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jeromopelurab/98051186733.pdf
    • https://uploads.strikinglycdn.com/files/ebbfd1d8-18ae-4bc3-9b88-933af8a29d44/blue_mage_ffxi_spell_list.pdf
    • https://uploads.strikinglycdn.com/files/190675a0-e3a5-413a-95ac-e0dd8e9a4c38/88478437724.pdf
    • https://uploads.strikinglycdn.com/files/4d01d3dd-6db9-4104-9e55-003454134336/74469530426.pdf
    • https://uploads.strikinglycdn.com/files/e570b0c5-74ac-4d57-a93b-d81b7a47818c/wiribemesofijimimisinumu.pdf
    • https://uploads.strikinglycdn.com/files/dc91e4ca-5296-42cc-884e-74f3252615ab/lotos_lt5000d_manual.pdf
    • https://uploads.strikinglycdn.com/files/45ce7364-e6bc-4f96-8a10-df0445523ed6/22mm_watch_band_samsung.pdf
    • https://uploads.strikinglycdn.com/files/0f678292-e5f3-490d-8a5d-8a893165caac/batavia_high_school_football_schedule_2019.pdf
    • https://uploads.strikinglycdn.com/files/25ee0f6f-852e-4b29-bcc6-06a78dbb5b22/critical_theory_today_lois_tyson.pdf
    • https://uploads.strikinglycdn.com/files/5fa194ea-f417-4eef-b6de-991305480791/monster_hunter_world_trainer_168030.pdf
    • https://uploads.strikinglycdn.com/files/036dd8ea-bf02-4c2c-a468-451e91966afa/color_by_number_pixel_art_monet.pdf
    • https://uploads.strikinglycdn.com/files/3f0c49fa-84a4-4a69-8a40-5f239bc62300/40994648491.pdf
    • https://uploads.strikinglycdn.com/files/8e1729d4-84f9-4879-81df-589e55624540/.pdf
    • https://uploads.strikinglycdn.com/files/6bcfb3ab-a559-4b9a-9cd5-5cb355064ee1/lattice_energy_diagram.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_off0000d0e3.bin
35bb15805502c1a4a8cd052ae77e120b94e5937663f48058b5b317bc4c685c1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 5384 bytes
font_01_sfnt_off0000e34e.bin
bed92e95c35552eaf6958f1e10539560149f1db5576259f8fef684b6fda7a5db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 12184 bytes

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