Malicious PDF — malware analysis report

Static analysis result for SHA-256 21717e0db9118c2d…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 07:02:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b7f317b67bd49bb8dda9bf47bb11ed32 SHA-1: 801726e21fe37ec68f891660131b3a9dd9ec1371 SHA-256: 21717e0db9118c2dba8c8782d77d8f2772655c396fdbd9ddf9bb75de5b90fedf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a link that redirects to malicious infrastructure, specifically advertising a 'Coin Master Hack'. The ML classifier strongly flagged this PDF as malicious. The presence of a download button lure and the embedded URL further support the malicious intent of directing users to potentially harmful content.

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/coin-master-hack-no-verify-game-hack In PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-to-cheat-the-new-roblox_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/hacking-laurenzside-roblox-account_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/claim-roblox_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/roblox-cheat-engine-walk-through-walls-2021_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/roblox-rules_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/roblox-how-to-fly-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/install-coin-master_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/best-free-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-to-redeem-free-codes-on-roblox_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-roblox-pikachu-accessories-2021_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/is-it-okay-to-use-free-models-in-roblox_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-to-make-a-free-vip-server-on-roblox_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-do-you-get-free-robux-on-roblox_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_off000033a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33A5 22708 bytes
SHA-256: 95296d9f7d351b24973503f6d84f1d2775cd08ff2d47afcdec39ebb59624c95b
font_01_sfnt_off0000665c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x665C 18316 bytes
SHA-256: d9834a5f9a8c6ed3a070f64237cdae77894c1c4114344e9b25aa33116d1541f7

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