Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be4ab1e49bbf608…

MALICIOUS

PDF

74.8 KB Created: 2021-01-11 09:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dec9e0a7cbf190982bb4542c79ffa394 SHA-1: 9560fbb3b0347ad66263e3f68a917b8339404046 SHA-256: 4be4ab1e49bbf608d500c459b1284dbcbbd9e262debe521260c642a0a894f0aa
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors. The document body, though heavily obfuscated, contains references to 'Mario gba rom games', suggesting a lure to attract users to click on these links. The primary heuristic firings indicate the PDF is a malicious redirector and a link farm designed to distribute malware or phish users. No scripts were extracted, but the embedded URLs are the main threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=mario+gba+rom+games In PDF document text
    • https://keziputaxa.weebly.com/uploads/1/3/2/7/132711938/bcc90.pdfIn PDF document text
    • https://sutesesa.weebly.com/uploads/1/3/4/8/134871168/1276234.pdfIn PDF document text
    • https://fenejetamop.weebly.com/uploads/1/3/4/6/134697978/7741303.pdfIn PDF document text
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/1893134.pdfIn PDF document text
    • https://cdn.sqhk.co/nigulavax/0Y4xBnm/spectacled_bear_predators.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5fcb9ea879b7c.pdfIn PDF document text
    • https://riwinuwozobama.weebly.com/uploads/1/3/4/8/134868589/vitutinu-jixologako-tokofovok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_5f9a8e651e7ba.pdfIn PDF document text
    • https://zajutarox.weebly.com/uploads/1/3/0/8/130814803/3909965.pdfIn PDF document text
    • https://nixalimug.weebly.com/uploads/1/3/2/6/132680811/filebafefavilotajom.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/hLQwieC/34180133946.pdfIn PDF document text
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/1679274.pdfIn PDF document text
    • https://ziropiwos.weebly.com/uploads/1/3/4/3/134311351/7a7baeda22e307.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/hjmOgii/ludo_king_mod_apk_unlimited_voice_chat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 5120 bytes
SHA-256: cbf97e22d93e4ba4eebf357bd7105e0de9ad3084dc78d120f909cea48cd706db
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 11172 bytes
SHA-256: 9c72b852b2bacd5e81901b7528b06b82837fe96c807dfe30eb5398e8fd5af8fa

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