Malicious PDF — malware analysis report

Static analysis result for SHA-256 907345ee101092d3…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 13:45:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2915271315f30522485ad1c69d1e36a6 SHA-1: 288b2ed3c11cf6e4d632254db43886bb3e62a1d0 SHA-256: 907345ee101092d31960f5e02134cdb0830ab4aec5d1ff6f17467e007fc93253
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising free Robux or game hacks. The document body and embedded URLs strongly suggest a lure to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the presence of multiple malicious links and the ML classifier output indicate a high likelihood of malicious intent.

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/roblox-free-robux-no-human-verification-game-hack In PDF document text
    • https://humansci.kyst.com.tw/image/data/files/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-roblox-robux-generator-2021-without-human-verification_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/logiciel-hack-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/arsenal-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-pokemon-go-accounts-level-35_GM1094591345.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/infinite-robux-hack-no-verification_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_off0000307e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307E 22088 bytes
SHA-256: d48ea7ee148f52d76b80e44c172c964656496f19763cad3d1ef2d5f8e1601951
font_01_sfnt_off00006145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6145 19408 bytes
SHA-256: d2ef309b92771ae7bb099a6b634574daefb8445dd777fce633f2a8c245e3903e

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