Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c859b458abbeb4c…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 22:32:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 705a00834160f775d46714d998039f0c SHA-1: eb76d50216b56d3b28d103b06512b69f1e38449e SHA-256: 2c859b458abbeb4cf50eb8764399f3aa16a516c3ff6947f443b8cfc573e97a02
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games. The heuristic firings indicate that these links are designed to lure users into downloading malicious content or visiting phishing sites. The document body, though partially obfuscated, reinforces this lure by mentioning 'Tiktok Free Boost' and including similar URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/835599320/tiktok-free-boost-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/username-and-password-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-u-roblox-items_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-lumber-tycoon-2-hack-deutshc_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/wurst-112_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-adopt-me-money-hack-2021-script_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-free-robux-hack-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/game-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/150-free-spins-coin-master_GM406889139.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_off000032e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E5 22116 bytes
SHA-256: 7d6071829e871263dbccc8a263f7e18d68fe30db170883de6c1be634301604b7
font_01_sfnt_off000063dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DD 18188 bytes
SHA-256: 7493db0d16a4d76003eaf86c009a42e55e8d617b13fe4e19c2c68abb79cddb25

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