Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce55abb1427c976…

MALICIOUS

PDF

37.2 KB Created: 2020-10-29 10:18:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9adb687f15197dead06c63140721e658 SHA-1: dbe46fb9555235d3da238927847354e569c0ad3e SHA-256: dce55abb1427c976ca491578fa3f11a58e9761daea66e736f14317e3925f8d36
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One of these links, https://cctraff.ru/strik?keyword=poopsie+unicorn+surprise, points to known malicious redirector infrastructure. The presence of a link farm suggests an attempt to distribute malicious content or phish users.

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://cctraff.ru/strik?keyword=poopsie+unicorn+surprise In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/45afef6e-05fb-4006-bf68-80fa99f94c48/gubowuluweveliku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2864/4508/files/89138674873.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9701/7506/files/96138122265.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2167/9771/files/38792899055.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3867/6894/files/litafelariloxulakufe.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/jessie_and_woody_love.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3563/8425/files/91424737388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36f1680-d67f-47bd-b7fc-098f60914834/vivulajirawiwikoluzenef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8386/5506/files/domestic_partner_imputed_income_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7063/4133/files/zijasonurubaza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4450/9111/files/mikeb.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/antioxidantes_naturales.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9129/1048/files/suvamagitenuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9470/2763/files/workshop_technology_machine_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2e9b01-11c0-45ad-bf1f-b8fd8b9ea4f3/56282639747.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8972/1496/files/mods_for_1.6.4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4279/8250/files/zebra_printer_zd620_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0878/9150/files/fifa_14_mod_commentary_download_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/newijizozisu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4491/1269/files/lirevilojudig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4bc1547-3f1c-4bda-9d34-339dc497b0fa/nisolabunalamegipavasul.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_off000053de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53DE 4688 bytes
SHA-256: bf8419bce9427d66833fe2e88f6ddc2af1b6b10888a70e686b0cba6767887dd0
font_01_sfnt_off000063e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E1 10592 bytes
SHA-256: 4380e01abd9d5812cfce7fea949aac5816d2ba2af87d713fe08d87e606ac241a

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