Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b6438f514706cf…

MALICIOUS

PDF

34.4 KB Created: 2021-07-07 00:05:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4052728bad30c542e8df41b748b76670 SHA-1: 4c243155dc3c8f141e17221f016b8f784e42cfe2 SHA-256: 23b6438f514706cf5091e5d6375b9d687cfd176395d0fd50e733a22e1e5ef0ac
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to potentially malicious infrastructure, specifically advertising 'free generator / game hack' content. The ML classifier strongly indicated maliciousness, and the presence of numerous redirector links suggests a campaign to lure users to sites that likely host malware or phishing pages. No scripts were extracted, but the document's structure and embedded links are indicative of a social engineering lure.

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/479516143/free-minecraft-games-for-kids-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-k-upreme-freestyle-roblox-id_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-giveaway-2_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/games-in-roblox-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-com_GM431946152.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/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/comment-cheater-sur-roblox-retail-tycoon_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-spins-apk_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_off0000328a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x328A 22252 bytes
SHA-256: 88f74104a7b28747964501937d0407331291c4cc4c345379cd87a4c1d75dff48
font_01_sfnt_off0000638c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638C 18432 bytes
SHA-256: fce0cee9bb026e9b658c5a6be084441bf5d333caf380f9a351f6fa516673a190

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