Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf09894ef3409af…

MALICIOUS

PDF

68.3 KB Created: 2020-11-18 13:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 927b4239ac8a4d5e551bca3bd3b47bc2 SHA-1: d63f4a9899840e40f26ea60089eda7b630bf5f7b SHA-256: bbf09894ef3409afd957039eb92448573f4f42343294a350471e9424a1bacd96
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=tensor+de+inercia
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5f9257f38047a.pdf
    • https://lolijejolo.weebly.com/uploads/1/3/4/4/134442146/lelobawegorefek.pdf
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5f93fac0c3582.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/lajonozufaloko.pdf
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5f93c7b835aa1.pdf
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5fac27dfe0223.pdf
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f8d6e67d686b.pdf
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f889eeed60c6.pdf
    • https://cdn-cms.f-static.net/uploads/4416938/normal_5faf3e2544078.pdf
    • https://cdn-cms.f-static.net/uploads/4388040/normal_5fa8e9e52fbd4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/00878ee7-8a2e-404a-9d46-f3dda4333196/wwe_2k15_apk_pc.pdf
    • https://uploads.strikinglycdn.com/files/9da60e1d-3aa9-467b-affb-9cec441dca88/44663428888.pdf
    • https://uploads.strikinglycdn.com/files/47546379-b174-426c-9192-aa917237611a/7441947761.pdf
    • https://uploads.strikinglycdn.com/files/bc1c72ae-e318-4dc4-8140-9f247683602e/kolanenuz.pdf
    • https://uploads.strikinglycdn.com/files/a44bb589-5011-4018-82c4-55ee8fcc2414/85462258031.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_off0000d1a7.bin
4886118798bb59d07ae34ccbf3ac6d7f179b38a00c41a2d4751bed1505868d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 4848 bytes
font_01_sfnt_off0000e22e.bin
2e3dda3eac2f0896216ad7c6531ca0a65edb2ea8d55ca25d087efe9f5227f225		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 9952 bytes

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