Malicious PDF — malware analysis report

Static analysis result for SHA-256 b386a6de50f816d5…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 18:23:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 521b08a39e68f8cb403c5cf7c1e1690a SHA-1: 9179ba318bf843f118d65681189136c4db5f1dc7 SHA-256: b386a6de50f816d561d0a94b20be0e1c7a2a223f78b9cb7369ece6672ad99ebb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to trick users into visiting malicious redirector URLs. The document body and heuristic firings indicate a clear intent to lead users to potentially harmful content. The primary malicious URL identified is http://netcdn.tw/app/431946152/how-to-get-free-robux-no-human-verification-2021-game-hack, which is flagged as a known malicious redirector.

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/431946152/how-to-get-free-robux-no-human-verification-2021-game-hack In PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-teasure-hunt-simulator-hack_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-super-hros-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/hacker-mask-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-free-builders-club-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/shadowrun-cheat-codes-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-roblox-cookies-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-get-a-free-domino-crown-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-free-romdom-acounts_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-detectec-cheat_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/alo-roblox-free-items_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-free-boy-face_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-roblox-clothes-no-decals_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
font_00_sfnt_off00002e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E65 23044 bytes
SHA-256: eaccd091dbb85d3c2dabb5a5eb7cdb75c357ebde5d1e66d70ef0446820939c06
font_01_sfnt_off00006148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6148 19900 bytes
SHA-256: 071133fbd72890720303c8ecaa5d80d0b8671e9ee25b91c9a58bd6e8411eacd6

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