Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd588f6b131aaafd…

MALICIOUS

PDF

44.0 KB Created: 2020-10-14 21:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8287f3aee6c4353417792a219fb4d788 SHA-1: 74e3a055d9982a6fa2313c57775116c927f2e18e SHA-256: cd588f6b131aaafd4f1b3a3828c979132551202a5f209e901924e77c3b065b22
184 Risk Score

Malware Insights

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

This PDF contains a large number of embedded links pointing to external PDF files hosted on various disposable domains. The ML classifier and critical heuristics indicate malicious intent, likely for SEO manipulation or to distribute further malicious content. The presence of a redirector link further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • 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.link/pify?keyword=anita+blake+tome+27+pdf In PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/9232432.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/wijigomofiweb_lotitosede_jukis_dirum.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/palaj_xofepevez.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/fubisi.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/e9ff54.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/kedoxezezaj-temolej-zunemalavorun-mutelokowomimi.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/mezuber.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/delelides_dasexurekiwar_jajumab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/ser_vs_estar_worksheet_doc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2294/4922/files/jacob_wrestling_the_angel_vienna_genesis_ap_art_history.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1188/9573/files/lowell_c_mcadam_email_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1dee0e-09df-4f7a-bcc8-9a953ff875df/5278596472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ad6fe0-baab-4025-8c7f-59a649a8ac1b/demijategetoreroporumit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3426b7-5269-4886-809f-e8c67df078c4/vabowuvov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c84f588-5a1b-4544-91f6-351261012122/nomusizinivuzekigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2855f11f-3eac-4005-9418-3b4dac4d2fdd/78996375954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0700/2784/files/english_listening_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9498/1273/files/final_fantasy_xiv_shinryu_extreme_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f070df1-3a01-4783-babd-520f2e5d3ab1/saxekut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a923223-f988-4378-8fe9-aed39e5695a2/noxuzasuxuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03810082-1405-4713-9f61-92bd7d260c03/27972219274.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_off00006da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA2 5320 bytes
SHA-256: 0d903cd82d877c3c171b2b17e5f9cc97db8b975624cb91ea46b8acbf616e1ba0
font_01_sfnt_off00007faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAF 10308 bytes
SHA-256: 691c8a1528ad8e6893f4c028cb6bdedbdaf8da37577c87907883575261dca4f0