Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65a16fadda8df14…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 12:01:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d2925bb8044d43d1e33ba71a5ce7c08d SHA-1: 1f379c2f9d46691ba5bd445a3e0b2cb15317adf6 SHA-256: d65a16fadda8df14e29b7c38ebff7e244e3a4a0c4887de046db529ea77d8a5eb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with one prominently featured in the document body and flagged by heuristics as a malicious redirector. This URL, 'http://netcdn.tw/app/406889139/coin-master-free-spin-realme-products-game-hack', is presented as a 'free generator / game hack' to entice users into clicking. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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
  • 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 http://netcdn.tw/app/406889139/coin-master-free-spin-realme-products-game-hack In PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/como-hackear-roblox-apk-mediafire_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-hack-for-10-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/admin-command-for-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-get-free-robux-my-money-safe-s_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-robux-giveaway-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/get-free-cloths-off-of-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/tiktok-free-online-videos_GM835599320.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-hack-a-youtuber-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-robux-promo_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/campingvip-server-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-spins-link-2021-ios_GM406889139.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
font_00_sfnt_off000031a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A9 22388 bytes
SHA-256: c3434f61bb2523af88d7c094314759dd16044c5d1ce39143d588617da7fe0b3a
font_01_sfnt_off00006320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6320 18976 bytes
SHA-256: 9a063faea9114050ab3b1da930e9c077db51df0f0eeb33b8a77db856b87907e7

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