Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d8f32d1d422a80…

MALICIOUS

PDF

40.4 KB Created: 2020-10-12 21:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 68884148cc5e69907522322a13ec54cf SHA-1: 9d29fdf364c8a57c40468608ba6faf45378a018e SHA-256: 78d8f32d1d422a805c1930a113b767542b30e0a836a9eb9a035f7440d7dfeec3
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a novel download and the malicious URL. The presence of a download button lure and a large number of external PDF links further supports a malicious intent, likely to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=jheel+kinara+kankar+novel+pdf+download In PDF document text
    • http://files.whitezulubook.com/uploads/1/3/1/4/131409017/lakuzo_rerobagojolu_tutamipegadup_tunip.pdfIn PDF document text
    • http://files.optioneds.com/uploads/1/3/2/6/132695636/xopimuvopidevu.pdfIn PDF document text
    • http://files.thordonaustralia.com.au/uploads/1/3/2/6/132682620/bazajigid_niroradesu.pdfIn PDF document text
    • http://rukirefu.sarahkramerharrison.net/uploads/1/3/2/8/132814930/5218603.pdfIn PDF document text
    • http://files.trendythreadsboutique.shop/uploads/1/3/2/6/132695836/7894514.pdfIn PDF document text
    • http://files.foxwoodarabians.net/uploads/1/3/0/7/130775558/siwefasajudonuv-zifex-panolofeporawob.pdfIn PDF document text
    • http://vepuna.patmcculloughart.com/uploads/1/3/2/6/132695278/5887371.pdfIn PDF document text
    • http://wokiza.blayneylfh.org/uploads/1/3/1/1/131164048/83f6bd3335e.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/1/0496/7527/2349/files/square_and_cube_roots_worksheet_kuta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2687/3509/files/nigisasovetidazisekogalas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7483/7923/files/90712247595.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1265/2708/files/jutizod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1979/9192/files/usda_eligibility_manual_for_school_meals_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7811/4727/files/rotugenovopadokivar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4646/1336/files/69644505035.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_off00005f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4D 5156 bytes
SHA-256: 0781e480aa9d2ec9b42f26e89d2b5c003d0c4a091fa601915ca051f4a405a3c4
font_01_sfnt_off000070e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E1 10388 bytes
SHA-256: 1a28d4a8b537896209a20f2185d63f898491c0bee227292775af5a5810fbb852

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