Malicious PDF — malware analysis report

Static analysis result for SHA-256 48646d73b9e939e1…

MALICIOUS

PDF

39.5 KB Created: 2020-10-04 11:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4c719c308bbda9b00a0fc279e6439741 SHA-1: dafc0b3e8c08e03cc9013c26d789b19c7244af30 SHA-256: 48646d73b9e939e1db6cd4210ac6f859c0ef82afa91d845d947f3dd7ce76feb1
132 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=adventure+capitalist+steam+cheat+engine`. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Adventure capitalist steam cheat engine' and includes the malicious URL. The heuristic `PDF_MALICIOUS_REDIRECTOR_LINK` strongly indicates malicious intent, likely to deliver a second-stage payload or phish 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=adventure+capitalist+steam+cheat+engine In PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/99974885255.pdfIn PDF document text
    • https://site-1036711.mozfiles.com/files/1036711/favosizoxeroroguwum.pdfIn PDF document text
    • https://site-1040574.mozfiles.com/files/1040574/63190942600.pdfIn PDF document text
    • https://site-1039386.mozfiles.com/files/1039386/27371286069.pdfIn PDF document text
    • https://site-1039443.mozfiles.com/files/1039443/42282516649.pdfIn PDF document text
    • https://site-1036879.mozfiles.com/files/1036879/37634145309.pdfIn PDF document text
    • https://site-1037260.mozfiles.com/files/1037260/gupifunajarinizaxeri.pdfIn PDF document text
    • http://buzabej.4kirksonthetweed.org/uploads/1/3/2/6/132681393/solatazuvase-lujikinitopaxor-xisoponeg.pdfIn PDF document text
    • http://files.rudygdesign.com/uploads/1/3/2/6/132681307/ligame-tenejelovove.pdfIn PDF document text
    • http://files.amyannaart.com/uploads/1/3/1/4/131483491/nolazojume.pdfIn PDF document text
    • http://files.dmkconstruction.org/uploads/1/3/1/4/131454620/17e769908e5.pdfIn PDF document text
    • http://files.megansharma.com/uploads/1/3/1/4/131408250/c23af694e3bab2.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/1/0430/2176/2723/files/rupolix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4467/4455/files/demakasonanogokezirumaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4610/0392/files/1802266497.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_off00005afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFA 5536 bytes
SHA-256: 7aa31fb739bb82813a4dcb90bc73c25499a85652d60411f3b46c7cc10eaee59d
font_01_sfnt_off00006daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAA 10448 bytes
SHA-256: d5554ab986264ed48a52ba4e69423d6c0b54f049606d3ef87e553fda387cc280

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