Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdba0dbec847f2d4…

MALICIOUS

PDF

38.9 KB Created: 2020-10-25 06:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: bb2cebf3580262e334a1194b15692cc0 SHA-1: fff14b0ed25180640ce060163dbbe5f85750ea91 SHA-256: cdba0dbec847f2d49b84a661a6f7fde8e84746d713b25b1bdef530749932e074
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm infrastructure. One of the primary links directs to a known malicious redirector, suggesting the document is designed to lead users to malicious websites. The ML classifier strongly supports the malicious verdict.

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/aws?keyword=book+sewing+pdf In PDF document text
    • https://luxexawasoju.weebly.com/uploads/1/3/4/1/134109261/1776606.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/pitafakaxawo.pdfIn PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/73e6fccbec2dd09.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/4804019.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/89ff5f8d2cc3206.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/6062912.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/8cc7c75a98.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/wovojojovisusukit.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/parakefotulis.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/2884288.pdfIn 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/a95949d7-9e78-484a-b03d-0276cc07278a/7895446826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69be719d-e246-40e3-8260-e4c192ad35c7/the_crown_by_kiera_cass_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c11114-f347-4c5d-96fc-de04c83db9bf/gorevumilijijibowekaziwek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8821/4699/files/30371086374.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2485/4425/files/sataguriw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/vawufok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1120/9888/files/26145426840.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8363/5619/files/91608077914.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2798/9148/files/artificial_intelligence_dictionary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6262/3893/files/tank_trouble_4_unblocked_at_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2417/7093/files/an_orange_for_frankie.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_off00005ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD4 5076 bytes
SHA-256: 8f6e50710fd34c174d74f52bf71e0ecc5f512fab18600bf3a59089cb67c1e495
font_01_sfnt_off00006c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 10100 bytes
SHA-256: cc6439eb1f09a8681b6848767e8070ce8fea38285f29e1f1b16cd0354599188c

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