Malicious PDF — malware analysis report

Static analysis result for SHA-256 319a8c1488e21b5e…

MALICIOUS

PDF

39.4 KB Created: 2020-10-08 21:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e846469e9f761089637f8b3e98adb50 SHA-1: ec66ecc84f8b8455ba87ba7d50fed6877fec6388 SHA-256: 319a8c1488e21b5e97204e8e90170b88472e7e9541dd3100e45f95f5fad22ec5
184 Risk Score

Malware Insights

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

This PDF document contains a lure for game cheats, directing users to a malicious URL. The document is structured as a link farm, with multiple links pointing to external resources, including a known malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests an attempt to distribute malware or phish for credentials.

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://ggtraff.ru/strik?keyword=subway+surf+s%25C4%25B1n%25C4%25B1rs%25C4%25B1z+para+hilesi+apk In PDF document text
    • https://site-1040178.mozfiles.com/files/1040178/rimowizovapopuxekudusex.pdfIn PDF document text
    • https://site-1036874.mozfiles.com/files/1036874/memodivigigujuvabow.pdfIn PDF document text
    • http://xuvopifa.thehockeyprofessor.org/uploads/1/3/0/8/130874426/lijulamuzo_dakow.pdfIn PDF document text
    • http://files.animalclinicofchardon.com/uploads/1/3/1/3/131398374/sowireresibujebilix.pdfIn PDF document text
    • http://files.thevillageshala.com/uploads/1/3/0/7/130776002/3f5d2496.pdfIn PDF document text
    • http://files.sbmig.com/uploads/1/3/1/6/131636644/3844403.pdfIn PDF document text
    • http://jemobu.kiwi-erotic.co.nz/uploads/1/3/0/7/130776201/xexabuzole-nurefixajelag.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/0278b70f-9942-4534-824d-ae2de05b186d/73854620842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381ebd65-217c-4cff-9375-58223495b8d5/55447642480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43494e61-bbf8-43e1-93e7-00a0de9250ba/nalawusoteboguv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdf83be-19e5-4c0e-97f1-612f234a1d2e/rakikegavoxerizimoniw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3787/6639/files/34271979435.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4111/9647/files/68180328473.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3377/9611/files/staad_pro_manual_scribd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0497/2184/files/come_softly_to_me_karaoke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2682/7422/files/irina_bjrklund_ik.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_off00005957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5957 5572 bytes
SHA-256: e111896b86ab6805e836addb5264506f026cb3541d496d0b0f52aeb0ef3ebe94
font_01_sfnt_off00006c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C65 10648 bytes
SHA-256: 7c85ef8fd32981c98ae8b0e4b9a2b888819343b4c8f5fa24591a2fa9d7001f70

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