Malicious PDF — malware analysis report

Static analysis result for SHA-256 92aaad7deba6223e…

MALICIOUS

PDF

48.2 KB Created: 2021-06-09 08:25:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ac8b037ec3fdb3be5e858ce12d635f0c SHA-1: 350fef9c1fd2403749770730b0610c246473eaf2 SHA-256: 92aaad7deba6223efb683a50de1a8cad6db445d95dc7e45ac9b3564d66822a06
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for free Robux and game hacks, directing users to a known malicious redirector. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site. No scripts were extracted, but the document structure and embedded URLs strongly suggest a social engineering attack.

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.tw/app/431946152/how-to-get-free-robux-from-khaos-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/www-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/moon-active_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-free-flying-practice-place_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-quiz_GM431946152.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_off00005272.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5272 25368 bytes
SHA-256: 6b63de7e1b893e5cf764f7972f05463416e9a7142b3d5ab34369d7b06d7ea483
font_01_sfnt_off00008d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D04 3084 bytes
SHA-256: 4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636
font_02_sfnt_off000097aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97AA 18936 bytes
SHA-256: c62aec905c53f8a7475f1dae092f2196e992f48ae1e956fa8b07ebdd2f9337bc

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