Malicious PDF — malware analysis report

Static analysis result for SHA-256 66365f82448990e9…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 05:45:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c803896819e943f155f5b648d987619c SHA-1: 876ee3489649f6deaf8783d447c82f1f75cfb703 SHA-256: 66365f82448990e9c022a7c20e99429cfc09904e02389b69fb237561790096cf
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO link farms, suggesting a malicious intent to redirect users. The primary lure appears to be related to game hacks and generators, as indicated by the document body and heuristic firings. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest a malicious redirection or download workflow, likely initiated by user interaction with the document's links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/real-robux-generator-2021-game-hack PDF link annotation
    • http://lib.smklabor.sch.id/repository/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hacked-client-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/pubg-uc-buy-paytm_GM1330123889.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004dcf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DCF 27732 bytes
SHA-256: 2757e438f64a1ab7ba9fc67ee945a618dd908c905e54a6990b74890f45137717
font_01_sfnt_off00008d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D78 18660 bytes
SHA-256: 34bafee9e9fa54cbec66c73e5c60b6b360676a94b3a9814b04b79417a2c6596e

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