Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb9ae29965e0d86…

MALICIOUS

PDF

45.4 KB Created: 2020-10-26 11:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ed1cd3e30f38f4bd7339cd4157649870 SHA-1: c48435c136b77667ac297df5ceaf5b5b64da7a10 SHA-256: cdb9ae29965e0d86e5c9e8b4b8fe4de623487433bffe9e1dc41c629fbf7b4dfb
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://cctraff.ru/123?keyword=software+testing+automation+tips+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it. The presence of numerous external PDF links, many pointing to benign content, indicates a potential SEO poisoning or link farm tactic to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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/123?keyword=software+testing+automation+tips+pdf In PDF document text
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/bupabunobepawez_fumidodeku.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/divili_dapixi.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/xoteramerosikaja.pdfIn PDF document text
    • https://nexajatolotol.weebly.com/uploads/1/3/4/3/134308242/56448.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/bekupisikisu_weludepiw.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/4254983.pdfIn PDF document text
    • https://pufibifisap.weebly.com/uploads/1/3/4/4/134450659/3148104.pdfIn PDF document text
    • https://numomepezudoti.weebly.com/uploads/1/3/4/3/134320197/mikavuworigumefaga.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/1663185.pdfIn PDF document text
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/kafebe.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/41c2e7ef-650b-4c02-aaef-6c99a947ec33/wenufudatesogoxive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4740cb37-63a8-4afa-b4c3-2bd8d7cd7612/zavoborosus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab91baa-6b5a-4719-a9f8-5d858216f8a0/kpss_evveliyat_tarih_konu_anlatm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/949682df-203e-4f5b-b124-225a74357833/romiguxemewezetimarize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4302/7613/files/coleman_fold_n_go_grill.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3069/9414/files/mekuwoxatejagabasela.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7660/8688/files/98367455330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1049/0022/files/drum_machine_free_app_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8583/7989/files/fulton_vmp_boiler_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1130/8702/files/definition_of_business_intelligence.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/venupefezokefedorune.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3870/4284/files/7120740294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0222/3013/files/class_e_repossession_license_florida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6234/5384/files/11565014784.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_off00007022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7022 5524 bytes
SHA-256: 392a1bba654201a7813a635d40511ea17d612563d2e121d95dc8390ea4bc82ef
font_01_sfnt_off000082e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E4 10928 bytes
SHA-256: b39ad72c58ee9b991adc733d3ac8fe4287cf04d669604ddf97a17b20e9fbb920