Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b25524b15013a3…

MALICIOUS

PDF

36.1 KB Created: 2020-10-31 10:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3d570a9d505d1dc8e8074a27b9413ded SHA-1: d47c35950a20d2a8a314bb12cf379ab96cb4cf47 SHA-256: a4b25524b15013a3ec1ee0af9ae712ca18132efba63284fa5589328983b5a755
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to distribute malware or conduct phishing. The document body, though obfuscated, contains this URL and appears to be designed to mimic search results, suggesting a lure to entice users to click the malicious link. The presence of numerous other PDF links further indicates a link farm or redirection strategy.

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.
  • 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.
  • 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://ttraff.ru/123?keyword=dewalt+fast+charger+lowe%2527s In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_5f9990b3dcebe.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/3718456.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/b4b89c98d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f86f59b30c8d.pdfIn PDF document text
    • https://pumewigegokofav.weebly.com/uploads/1/3/4/3/134317234/pewajezixebero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1804/4070/files/14742667517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46751a2-dbf3-4fe9-b9b3-27f2609012b6/cavatina_orchestra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1388/0483/files/naverujatewuzejutar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69cae7d2-c26a-4943-a5c0-18fbb5f44742/tunipojamulomomelub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/como_descargar_crash_bash_en_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/google_android_device_manager_location.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/lm2575_adj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0970/9474/files/12581760419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cbb310a-00ec-475a-81ab-a4e73a1f9280/40776111294.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E52 5268 bytes
SHA-256: 7c8828ff7725a2420bbadd43e18095ad686d86ac0370786fbe825d6ef2fa6d87
font_01_sfnt_off0000605f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605F 10372 bytes
SHA-256: ba4bedf1ea75c1429bff1f55a4e5a6d7e6ad2a6a93a838064440aa89112f9df7

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