Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b50c7c544ebd31f…

MALICIOUS

PDF

190.8 KB Created: 2020-12-04 15:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5306f1941c515453c873ef7f12a104f1 SHA-1: db6167243c505b91e1ddc590dff3011688d556ae SHA-256: 9b50c7c544ebd31f75ed9ac97fdf8c04cb7a69399d2efd01b432112cf4f7e494
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical alert for a malicious redirector link and a high ML score. ClamAV also detected it as a phishing trojan. The embedded URL, https://ggtraff.ru/strik?utm_term=hearthstone+one+night+in+karazhan+heroic+rewards, is the primary indicator of malicious intent, likely leading to a phishing page or malware download. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=hearthstone+one+night+in+karazhan+heroic+rewards
    • https://cdn-cms.f-static.net/uploads/4406482/normal_5fbb6cbe5a6c9.pdf
    • https://lisilabonefep.weebly.com/uploads/1/3/4/5/134527166/4804979.pdf
    • https://cdn-cms.f-static.net/uploads/4423728/normal_5fbd769a26eaf.pdf
    • https://cdn-cms.f-static.net/uploads/4420756/normal_5fb4bf48d8489.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0bebbcd1e280355d37542/t/5fc1d512f3de5e49b5a7d515/1606538517617/35999866424.pdf
    • https://uploads.strikinglycdn.com/files/fb466fef-0915-4dec-93d9-f19284a4a1de/63128001730.pdf
    • https://uploads.strikinglycdn.com/files/f299fc1d-9d94-45f5-a43d-54aaacf94b39/nickelodeon_rugrats_guide_to_adulting.pdf
    • https://uploads.strikinglycdn.com/files/e211e71e-6e45-477d-9861-73610556afd1/76746407850.pdf
    • https://s3.amazonaws.com/xebuvuwov/in_native_american_families_sociology.pdf
    • https://s3.amazonaws.com/xatojem/dopabe.pdf
    • https://uploads.strikinglycdn.com/files/b30b7b2f-0e1a-4bac-859a-d01e6f49a293/lukasufitufiw.pdf
    • https://uploads.strikinglycdn.com/files/2fe6bcf2-2deb-4367-a436-97b738d4bca9/used_t56_transmission_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/fcb2fc46-2d57-4446-a1b0-7818b848df1c/82355013814.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe003ef8cdb769c6a9b041/1606287424678/13446260745.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_off0002b5b0.bin
dda7513e721554dc1911de131ed5e364740355596b346070674547c94d17281d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B5B0 5336 bytes
font_01_sfnt_off0002c7e5.bin
19f46650d3b2bd1240bbf3bf15747ed31a0218d3c10df32e597d2ff281e25ad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C7E5 10904 bytes

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