Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb818e3162ddd7ce…

MALICIOUS

PDF

39.4 KB Created: 2020-10-31 10:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 71f4ea65694e7b4094bec4f533da01d8 SHA-1: 2de25acde68a3aac1dcc8cbe9a176a99894b60a8 SHA-256: bb818e3162ddd7cee11705a7fcb83b79a946926981dcdc757c6797c89f1397a5
102 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded artifacts suggest it is a lure, possibly for a phishing or malware download campaign, indicated by the SE_DOWNLOAD_BUTTON heuristic. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this file.

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.
  • 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/wb?keyword=jcb%20owners%20manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_5f8d7b3d03922.pdfIn PDF document text
    • https://debaduvevuw.weebly.com/uploads/1/3/4/3/134383420/fizupoto_voravanok.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/subud/vikoraludororezukeno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9263/8369/files/chuyn_file_sang_nh_jpg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7785/2068/files/trb_2020_annual_meeting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4041/5644/files/disovaxezogunixebowaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8319/5080/files/paxefux.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/xivapolebitila.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/pikudozenixar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8748/5342/files/playmobil_victorian_mansion_5305_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/called_me_higher.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/rugupose.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/calendar_2018-_19_india.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/bonuvifo.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_off00005b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2B 5168 bytes
SHA-256: 92f267ba2a2fb96240271933d0be512c78d03e02712880b926e1a21a60ef99ec
font_01_sfnt_off00006cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB7 10756 bytes
SHA-256: 4bd008c889d1128dd6d7a5c3032af7dce7c37fe814483e8a800c461b1e92d165

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