Malicious PDF — malware analysis report

Static analysis result for SHA-256 821df637f38ef69c…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 01:35:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 099a9d50fc966f6cc6bd11e1450a0a09 SHA-1: 2e2d4b1447b3593ea759f2dc84f011972a4cb840 SHA-256: 821df637f38ef69cb6d5eeb3793b36cb0c242a466ce14889f970a6f795066ec7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body and extracted URLs strongly suggest a phishing or scam attempt designed to trick users into visiting malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/free-roblox-adopt-me-pets-game-hack In PDF document text
    • http://librarysenior.com/repository/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-tiktok-engagement-calculator_GM835599320.pdfIn PDF document text
    • http://librarysenior.com/repository/master-coin-free_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/android-fast-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-item-command-consle-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-cheat-dungeon-quest-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/robux-website_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/rape-simulator_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-free-robux-extension_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/game-give-free-robux_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_off000030a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A5 22376 bytes
SHA-256: 0704eb4c3a37f8c944655dcb0087083d9ca32b0b1feb37503563c1a23387b055
font_01_sfnt_off00006289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6289 19452 bytes
SHA-256: 7b9be5883f45f02dbb03249ff61d9220e610f7b45a0bb0632252067c450821da

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