Malicious PDF — malware analysis report

Static analysis result for SHA-256 c671e97676beb9d2…

MALICIOUS

PDF

35.5 KB Created: 2021-07-03 19:06:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 08cf9b983576696ecac63a15cd8abee5 SHA-1: 0a5139f02461eede0bcea6c0fdd70a273e6598ba SHA-256: c671e97676beb9d2e2025f7e234d65a2b9fe742551268897b27778c6a09fc0a8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game hacks and currency to entice users. It contains embedded links, including one to a known malicious redirector at http://netcdn.tw/app/406889139/coin-master-free-box-game-hack, which likely leads to a further malicious download or phishing page. The ML classifier also strongly indicated maliciousness.

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-free-box-game-hack In PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-unlimited-fps-hack_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-legit-2021_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-hack-in-roblox-using-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/mc-hacks_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/half-hacker-half-guest-roblox-300x300_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/comoponerse-hacks-en-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
stream_002_off00003283.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3283 23536 bytes
SHA-256: 13af5fa7c5fd2ee823f97ddfe5c4f73b851f0cdc5e08f4f26d03dba8bba3dd08
font_01_sfnt_off000067da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67DA 18424 bytes
SHA-256: 06e1a8abdfdbc1378574cba0468ab56135a39765f7a16652ed09c5636b933370

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