Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fef9bbe9a3a521…

MALICIOUS

PDF

48.0 KB Created: 2020-10-25 19:29:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3d4bfcae1e219fcfedd3ce31476edbc SHA-1: d39d3255cea17b59df24f4e709d45df512f38abd SHA-256: 68fef9bbe9a3a5216077555deea5ee3c3723479b672dcf5df6fa0d891c6030cd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to distribute malicious content. One prominent URL, 'https://gettraff.ru/123?keyword=solve+for+x+addition+worksheets', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting an attempt to disguise the malicious intent as educational material.

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://gettraff.ru/123?keyword=solve+for+x+addition+worksheets
    • https://zefufewik.weebly.com/uploads/1/3/4/3/134374544/38dc9ad54f.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/kopiwu_gotatumeturi_bovejixegas_vivikow.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/sovumuvidizisi.pdf
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/pomasokok.pdf
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/cd6fdf.pdf
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f87ea3c2e0e0.pdf
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5f91d0171cfe9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/190db830-cfe9-47f1-ba7f-cb9a4df63d0f/kabolabasusigijotep.pdf
    • https://uploads.strikinglycdn.com/files/1f723939-a2a3-4912-81c6-97d8d8502bb9/exercicios_resolvidos_linguagem_c_funes.pdf
    • https://uploads.strikinglycdn.com/files/201a8f0f-85d0-4688-8835-8a17a8bb7376/posaden.pdf
    • https://uploads.strikinglycdn.com/files/c1c5143f-b950-4283-8436-0286747ac07f/tarakopefuzuniwukurite.pdf
    • https://uploads.strikinglycdn.com/files/33f135de-9a6a-4fa3-927d-c064feb1f513/52746962056.pdf
    • https://uploads.strikinglycdn.com/files/ecfa3f60-342b-4589-92e1-8977ca9e116a/zugozivepulawujepope.pdf
    • https://uploads.strikinglycdn.com/files/092c4667-9192-425a-8ece-ce08254d318d/43051730810.pdf
    • https://uploads.strikinglycdn.com/files/78aea798-33fc-48c0-adf4-814fd08e4faa/4257377567.pdf
    • https://uploads.strikinglycdn.com/files/b9199dde-8604-4886-9f53-0d5b22dbdfd1/intel_i3_4160.pdf
    • https://uploads.strikinglycdn.com/files/c386420e-2f79-486e-a62b-36e2c89ebea9/farezemapowis.pdf
    • https://cdn.shopify.com/s/files/1/0266/9825/2457/files/bigo_live_call_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/jedubitipuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c61.bin
fcc9b62bf949128e4831fcb8e52a67a0b31e7cd2192d03f3d7f0651a84e6e29d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C61 5168 bytes
font_01_sfnt_off00007dfa.bin
cbd626131ebb018650207252a828ad36c526cb425c5b1e262179204f3b87568d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFA 10840 bytes
font_02_sfnt_off0000a2ef.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2EF 4324 bytes

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