Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cecfbe6e76921a…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 06:18:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f22b335eed80380e147532186c825d94 SHA-1: 7295032e80dd294355d1955869136c5b274dc798 SHA-256: 19cecfbe6e76921a33bbe7bd0fb03d99301b2bb9fddff7927680c8d2f740347c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks. The primary URL, http://netcdn.tw/app/431946152/free-roblox-website-game-hack, is identified as a malicious redirector. The document body, though partially garbled, reinforces the lure of free game-related content, suggesting a phishing or malware distribution attempt.

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/free-roblox-website-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/infinite-jump-wearedevs-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-deadzone-remade-hack_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-pet-snacks-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-play-for-free-sign-in_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-free-robux-in-1-minute_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-giveaway-now_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-robux-free-sin-pastebin-2021-con-jugar_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-full-games-download-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-com_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_off0000304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304A 22228 bytes
SHA-256: 91c2bd762fa23214d7cf0a74ff803112e4f9b45394a4fc00e732db003de02ced
font_01_sfnt_off00006187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6187 19072 bytes
SHA-256: f0d59f1b4b35e580c3840cb277f851b856516c1cfd4bb27d28d5a2db6d497b93

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