Malicious PDF — malware analysis report

Static analysis result for SHA-256 334dfeb92787dcbb…

MALICIOUS

PDF

34.8 KB Created: 2021-06-27 01:44:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 315fe2fb0b7b3e5be2ae86dcd8f56585 SHA-1: 3413824fffa514798a5a782abad46f6b570e5dcf SHA-256: 334dfeb92787dcbbe029e410ed4bfb38f897b94ef2405839b42daf0494e1dfb4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacking for Roblox, directing users to a known malicious redirector. The document body and embedded URLs indicate a phishing attempt to trick users into downloading potentially malicious content or visiting further compromised sites. No scripts were extracted, but the presence of malicious redirector links and the lure strongly suggest a phishing or malware distribution workflow.

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.co/app/431946152/hacking-for-games-on-android-roblox-game-hack In PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-hack-and-get-free-robux-2021-fast_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-exe-editor-cheat-engine_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/cool-robux-hacks-lol_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/cpbildco-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-hack-roblox-june-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-roblox-font-download_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/fb-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-group-payouts_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 22248 bytes
SHA-256: a0201ad6b866419308e0b31947ee022ec06400be38289112dea1352ab40320ad
font_01_sfnt_off00006217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6217 19376 bytes
SHA-256: a6772fe899e59f7a864752f13ba3305756f43e09d25660f1824553f3c2cdc9be

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