Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ebfbc983242ebf…

MALICIOUS

PDF

44.4 KB Created: 2020-08-10 06:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b2e86be0dbcedace7010bb4098ff5b SHA-1: a715c2daec36a9ce147ca417fd250a986ffb6c1f SHA-256: 28ebfbc983242ebf68d7a607c46449b0431404d66ea522cbf105c0ba32ac4970
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the URL for the malicious redirector. This suggests the primary purpose is to lure users to malicious sites.

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.com/pify?keyword=eclipse+aspectj+pdf
    • http://files.safetechconstruction.com/uploads/1/3/1/6/131636855/fifedurisalit-roziki-vubuvu-valekarepen.pdf
    • http://files.dricc.org/uploads/1/3/1/1/131164574/jerelonojotogus_lubosabisu_xivigefu.pdf
    • http://files.orizoncenter.net/uploads/1/3/1/3/131380354/79b414f8.pdf
    • http://files.fam-ilyproducts.com/uploads/1/3/2/6/132681823/lupowadida.pdf
    • http://files.dunsmuirdeerhounds.com/uploads/1/3/0/9/130968968/3711531.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/business_communication_process_and_product.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/ruxurelaza.pdf
    • https://cdn.shopify.com/s/files/1/0447/0757/8009/files/auricular_therapy_a_comprehensive_text.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/9120064206.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/11th_maths_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/56940512206.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3135/files/topajujerabakivabidaxidix.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9155/files/9729586462.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/23330806694.pdf
    • https://cdn.shopify.com/s/files/1/0449/0277/6999/files/nejeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/blank_page_insert.pdf
    • https://cdn.shopify.com/s/files/1/0433/2804/5209/files/rofadesizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9612/9192/files/fafsa_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/achieving_authentic_success.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006322.bin
7f0d7a5b0e2d1d4e3acfa021c3c34f1be44b2656f7d9ebff090a247421749c5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6322 4660 bytes
font_01_sfnt_off00007301.bin
e9bcabed520aa3dfe63765f9590bf05f958c3517b50651dff118e61be4d520e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7301 10416 bytes
font_02_sfnt_off0000969d.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x969D 4324 bytes

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