Malicious PDF — malware analysis report

Static analysis result for SHA-256 2662be0f9dce1c13…

MALICIOUS

PDF

39.8 KB Created: 2020-11-04 10:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 53c0e9a82e4c4bb642234c63b1a133dc SHA-1: 3b370c05b53a52a0a0f06a7d3a6031d44068e5ac SHA-256: 2662be0f9dce1c13439d92d3dcd600b52cf52bef8945cf2cde800c28cefed129
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, disguised as a download button. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick the user into clicking it. The presence of numerous other PDF links further indicates a link farm or SEO poisoning attempt, likely to distribute malware.

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=hygeia+enjoye+breast+pump+review In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413467/normal_5f9bda83df23e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5f96f417f37d5.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/sotifuruwozep_vuvukurowetid_gaxiranilejaz.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/1b999fdeba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5f8be053cc394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f923ef1ac4ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f87b4e78a1a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_5f92a819b395c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tadovu/84186355978.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/soccer_header_games_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/effective_leadership_styles.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/nilawivumoxitopamo.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/musculos_de_la_espalda_baja_y_gluteos.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_off00005bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDE 5536 bytes
SHA-256: 32adc55bb613549cd0441b795e9203c9983b58f47b92845ffc5c8c780a71b30b
font_01_sfnt_off00006eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB7 10560 bytes
SHA-256: b34d290ff2b76b8b4dd5be34b0c1b7ec12732dec5f9aa9fe8b379daf305f6325

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