Malicious PDF — malware analysis report

Static analysis result for SHA-256 62546431d4eb09f2…

MALICIOUS

PDF

35.7 KB Created: 2021-07-06 09:16:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3f4bc93112f3d4b7dedfb38e0e787df8 SHA-1: d7fefe410a1a1a89b7a2cf89dcb7248b0048f0e2 SHA-256: 62546431d4eb09f2e92ebc83ae39b257adb4b4f0d89f42a9c5eeb31be6ef2efe
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a LOLBin command-execution lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-exchange-40-free-spins-game-hack PDF link annotation
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-qr-code_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/download-robux-online-hack_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-hack-high-school-life-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/prison-breaker-hack-script-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/thats-cheating-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/worst-client_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-hacked-twitter_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/is-it-possible-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/babe-free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/cmd-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-robux-group_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.feb.unilIn macro / runtime command snippet
    • 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_off00003344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3344 23160 bytes
SHA-256: 3e9f96370e4e065d529ff092caca30fdbb3cbebe77bc72fed8df0ae49621532a
font_01_sfnt_off00006776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6776 18784 bytes
SHA-256: a55e0405ff3bfab9d769a08cfac276b2ed12e9db12c028e86e38811cb184192a

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