Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b5c72b830c575c…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 06:14:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fe43b47f5b52073c32ab96585c1dce13 SHA-1: a0f4a1caef7188a738d30030ccde24ee8acdc771 SHA-256: 03b5c72b830c575c80a2ccf049aca405c1a1cc686a5d04b3a43c666e13fe12c4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a lure of 'free spins' and 'game hacks' to direct users to external URLs. These URLs, in turn, host numerous other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a download button lure further support a malicious intent, likely to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://netcdn.online/app/406889139/free-spins-coin-master-hack-2021-game-hack PDF link annotation
    • http://perpustakaan.pa-dompu.go.id/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/roblox-top_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/free-robux-codes-and-free-roblox-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/coin-master-hack-pc-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005207.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5207 25292 bytes
SHA-256: 8e81485af4d44b6631f6d1784b5d0c1dfda853d328bcbcef4e1e931e7b66a72e
font_01_sfnt_off00008bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC1 18456 bytes
SHA-256: 8f74d6ddd2abce9f563610cbfcc253ce51c057807514da134dc64dcb58b7111e

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