Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fce6363853fd941…

MALICIOUS

PDF

48.4 KB Created: 2021-06-03 20:51:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 448639cf63bf5f54d220b03966a7d138 SHA-1: 1db17aa7cf1963bb733bc99cd3f1ebabf0690975 SHA-256: 3fce6363853fd941578cc308ef9cf545680fd401896fdeb785c46daa7e8bf817
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a "free generator / game hack" lure. The embedded URL, https://netcdn.online/app/406889139/legit-free-spins-coin-master-game-hack, is associated with known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/406889139/legit-free-spins-coin-master-game-hack In PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-daily_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/robux-converter_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-do-you-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-games_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-account_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005591.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5591 25116 bytes
SHA-256: fa307a8fc60236999e1b5777b69f6e8890b03ab34617bad49d093a5c38adf6bb
font_01_sfnt_off00008e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9D 3428 bytes
SHA-256: b2ecb6262ec4ba27346d50989faad01b28cb5404ac3dc6f00790045e051680e4
font_02_sfnt_off00009ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB4 18176 bytes
SHA-256: 0e4f5fc6ff2fec7c34f7a60300b1fa14fa22cd043badad59a9fad54dc28be7cf