Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3100d1400a84ac8…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 04:11:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9eb71840da5c419bc3a8236e7eb2a6de SHA-1: 49d145f5212c9ee918ac2e21258e5b50c8c45134 SHA-256: f3100d1400a84ac89bfefca131076adf5a44fed82e6b48c8226e4351756e6bf2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links and mentions of free spins and game hacks, strongly suggesting a lure to download malicious content. The ML classifier also flagged this PDF with high confidence. The primary IOC is the URL http://netcdn.tw/app/406889139/202100-free-spins-coin-master-game-hack, which is likely the download location for a secondary payload.

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/406889139/202100-free-spins-coin-master-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/roblox-scam_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/dragon-ball-online-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/hack-de-robux-al-instante-gratis_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/hack-any-game-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/moonactive-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/cool-free-things-on-the-catalog-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-hack-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-apocalypse-rising-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-ot-get-free-clothrs-in-the-catalog-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-do-u-get-free-robux-2021_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_off00002d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D6E 22628 bytes
SHA-256: 1125690d236b4acb791684219e63f3881408e9970bbdc1f8c4b5f2e776645978
font_01_sfnt_off0000600d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600D 18576 bytes
SHA-256: e072abe3ddea7348b6ad42f3e58cf0336d8cc97c01862fb082958ccb0059bec3

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