Malicious PDF — malware analysis report

Static analysis result for SHA-256 667a47dc440a1fcc…

MALICIOUS

PDF

43.9 KB Created: 2020-10-31 13:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b763da41e6542ab500c2ab5c5dd2a92c SHA-1: b3eb69fd944d3b2d9642fe001edb0e30fa3d1b77 SHA-256: 667a47dc440a1fcc5f89b29ed44e66dd70472cbffa028af6722253fc5251d6e4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though obfuscated, suggests a lure related to HP printer software. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms that at least one URL leads to known malicious infrastructure, and PDF_SEO_LINK_FARM indicates a mass of external links, likely for SEO manipulation or to host further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/123?keyword=hp+photosmart+d110+software In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5f9c77851b40d.pdfIn PDF document text
    • https://vefotufujipewux.weebly.com/uploads/1/3/4/4/134401009/37c90a957cc.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/sedoxij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f9142a41b4b7.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/2403684.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/6150779.pdfIn PDF document text
    • https://velebipuzufal.weebly.com/uploads/1/3/4/4/134434208/65584.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/9858893.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3203/9583/files/fasokimifojafedadevot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4390/3905/files/4818997255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e8ccee-7059-4553-ba21-30abb40c1518/92060566373.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/titanium_tv_apk_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/34248761409.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/advanced_materials_and_processes.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/download_meetme_plus_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6050 5128 bytes
SHA-256: b5a48d6977fe8203174737b0e6609e37a02c16c308c793eaee3d81fdcecc5801
font_01_sfnt_off000071cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71CB 10152 bytes
SHA-256: f9ccc37fafa2f205a181412b185ec5f93a520152f13220ffa200957ab8968c6d
font_02_sfnt_off0000947a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x947A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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