Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16bcc4ad119f994…

MALICIOUS

PDF

48.9 KB Created: 2020-10-30 16:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2e1654a837413f5f47ab87c02017fe40 SHA-1: 19a3a19d039bf98ba75ee9f19d22c0989bd4443e SHA-256: c16bcc4ad119f994017deb48b1bdd513ab104468269d13f637f4b1d4163c5000
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'https://ttraff.cc/123?keyword=whirlpool+microwave+oven+user+manual'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise its malicious nature. The presence of numerous external PDF links further indicates a link farm or redirection strategy, likely for phishing or malware delivery.

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.cc/123?keyword=whirlpool+microwave+oven+user+manual In PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/sepejugawomorum.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/xobeb-wuwobumebex.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/kexamali_gipaz_zewixaberobax.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/bedegixijibutup_libavugipe_xozinexaxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6852170b-d8b7-45f7-bbff-5621df40c54e/67080061586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60efa05b-79d1-421f-afc2-9a8ad84c3e24/modern_database_management_12th_edi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67160c70-d519-429e-a37e-b2db11ce3a3d/60438546827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/4537/6954/files/cooler_master_elite_350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4039d053-d9bc-41b3-a90e-d6c7dafa453e/zezix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6879/6311/files/kwikset_smart_lock_reset_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c9fe8d-08fc-4ae6-83a8-694193a2ecad/wowiligixebafedubezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dce0692-3c05-46df-b298-283cd7b9836c/omar_khayyam_quatrains.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1851596e-2b8e-40ee-9790-c7dfdfee3770/winrar_apk_cracked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796e6625-3fe5-4997-8037-bb9206fcd8ee/55001076104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebee49f-8d27-42c9-aa24-77a58c48e369/cuento_de_los_hermanos_grimm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8303/7860/files/bepuvujujepafavu.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_off000080c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C5 5340 bytes
SHA-256: 7258286e1476b9bf63b9a9cb1bc9a487f7f35d280dcb20b06795dd235aabb3de
font_01_sfnt_off000092d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92D8 10364 bytes
SHA-256: 9bab9b26be32765bf6d024abaccdc2f7ea0c3da7eef9feb8c68df9a5c9e5d7f9

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