Malicious PDF — malware analysis report

Static analysis result for SHA-256 246dbdbbc936d87e…

MALICIOUS

PDF

33.9 KB Created: 2021-06-28 15:14:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2a921e7005d8c73dbb00b4f506f9c5f2 SHA-1: 351564df17d36881b27343505d9dea408b9ac748 SHA-256: 246dbdbbc936d87e1bf1319265565e47d529a2d74976d2672e23e9f6ecb0f078
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirectors and download sites, masquerading as 'game hacks' and 'generators'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates these links point to known malicious infrastructure. The ML classifier also flagged this document with high confidence. The primary lure is the promise of in-game currency or cheats, a common social engineering tactic.

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.co/app/431946152/download-roblox-hack-robux-free-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-jump-fly-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robuxs-no-offer-real_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-make-everything-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-sand-simulator-hack-for-android_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-do-the-frog-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-cheats-in-roblox-jailbreak-yt_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-pet-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-i-get-robux-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-generator-com_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_off00002ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CCD 22372 bytes
SHA-256: febdbf0c2a3d4cb7882a04650e6d8057dab7e86430785bf55992b2d12eae41a2
font_01_sfnt_off00005e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E20 19464 bytes
SHA-256: 793f407206c001c6bebe459dbf997f4ded7f9e7b668eef1ffe80b558fe3d5690

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