Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88cf698b7659fd0…

MALICIOUS

PDF

76.7 KB Created: 2020-11-08 15:10:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 58fa5bbb0b8bf73c041c98b1255b9238 SHA-1: 9b92d3e759cb651a5e5be0ff966422b24556c764 SHA-256: b88cf698b7659fd06effbc36d498ea517b7ecb0905cc73c9e9661db85bf9a0c2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/123?keyword=play+lego+dino+attack+game PDF link annotation
    • https://dozasasakebo.weebly.com/uploads/1/3/1/1/131164234/nonalurutu.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/33e6309c.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/410380.pdfIn PDF document text
    • https://mitixofixomu.weebly.com/uploads/1/3/4/3/134333727/7024332.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gogajajar.files.wordpress.com/2020/11/48539197016.pdfIn PDF document text
    • https://gudusuk.files.wordpress.com/2020/11/rofugibazamemedipiwabuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db09864d-66d5-467c-b007-aced693d0f1c/19976336897.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/links_awakening_trading_shovel.pdfIn PDF document text
    • https://wivavir.files.wordpress.com/2020/11/hyperdimension_neptunia_re_birth1_processors_guide.pdfIn PDF document text
    • https://jirovef.files.wordpress.com/2020/11/practical_object-oriented_design_in.pdfIn PDF document text
    • https://defuzatuzor.files.wordpress.com/2020/11/2nd_line_hack_apk.pdfIn PDF document text
    • https://vuvelowol.files.wordpress.com/2020/11/lerogojinijaduzet.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/866-707-9836-9677_is_true.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199b7729-beb8-4d49-8775-f5bdd41e2352/58562017549.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_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 5152 bytes
SHA-256: 61d926536fbfec50275f5d9f8ce11ac11570bfcc3948a890f10ee277fe984a50
font_01_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 11216 bytes
SHA-256: 64ea60693f13072df200d9d9f44c05f7b6e1673043841249757a279c4be95781

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