Malicious PDF — malware analysis report

Static analysis result for SHA-256 4492ce7528620f54…

MALICIOUS

PDF

46.0 KB Created: 2020-10-25 17:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: eecf10f9235b237ae9ed8c538d8139ee SHA-1: 5e8677f4832e5838158269ec7d20863af4ec2fd1 SHA-256: 4492ce7528620f544ff8d84d15193714031e42d55ac8c05ed1274f99c0e123cb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to disposable hosting and redirector infrastructure. One such link, https://ttraff.ru/123?keyword=at%2526t+unlock+instructions+email, is flagged as malicious. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, likely as part of a phishing or scam campaign.

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.ru/123?keyword=at%2526t+unlock+instructions+email In PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/laresisif_kigadebokenub_bajutinerid.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/fivogapu.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/dozafawegikuxoto.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/xopowinubomokon-zozofefodijawuf-bimafajawevagu-pilavebenixe.pdfIn PDF document text
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/vatijijepamebanuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_5f90c0c234ab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f8b02f2abf9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5f93cb7b9882b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f8f3ae029e84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5f8e24bbb2d51.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/1b401337-e41e-48fd-9d70-f240adcaea39/29853278001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f05dadf7-5e3f-4260-bc9e-98ffb718e234/ethics_bowl_cases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8d6fe85-87b2-4c98-8033-1b2528501c18/49645505838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa425ce9-6e99-4e48-80b1-a8ea911288df/pusezupefinedotosasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7138d77c-1aef-40fb-ab9d-332edd8520d9/emotional_intelligence_2.0_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/aquaculture_biotechnology.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/az-_300_download.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/vurixozuxogok.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/jolaninewabisafixonetolir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9250/2437/files/50550902059.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3572/1628/files/84265812086.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0558/9920/files/minecraft_mirror_banner.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1882/9991/files/kuet_admission_circular_2020-20_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5198/1244/files/statutory_declaration_qld_form_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C2 2988 bytes
SHA-256: 073cba114baa0e59148b1de60c35092a802147fd5887ae0565468f81448d2a8e
font_01_sfnt_off00007173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7173 4144 bytes
SHA-256: 8c699d88a9e3dd9a3e7a1792fa5950838dfae4ec993c32ddb802c84b8e7a5909
font_02_sfnt_off00007f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F93 14668 bytes
SHA-256: 7bb62c9381da516cb45372cadd5d7b0c972b0296163e481463a4d1d6364d6b20

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