Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4c7ca10b910923…

MALICIOUS

PDF

34.9 KB Created: 2021-06-20 00:50:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0f30ed8fc7fa0aee2bcf563b9156a694 SHA-1: 18ad094d07431f5167ebec6d13aba9ccbd416a0c SHA-256: 3f4c7ca10b910923829a1b2af3958fafdd1fb096726be84601f19af2d98d7ef5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to redirectors and lures for game-related cheats and accounts. The heuristic firings indicate that the document links to known malicious redirector infrastructure and uses a common lure for free game currency. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier output suggest a malicious intent to redirect users to potentially harmful sites.

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/free-rich-roblox-accounts-2021-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-place_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-accounts-and-passwords-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/get-robux-today_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-hack-wish_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-any-face-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-games-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-bonus_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-robux-android-fast_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-into-the-big-brother-house-roblox_GM431946152.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/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-for-real_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_off0000303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x303D 22456 bytes
SHA-256: 46c06bea11e5c1cb7b8ff78ab0ddafac0ad7e54ac4975f8017238ca633c955cd
font_01_sfnt_off000061e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E6 19580 bytes
SHA-256: b71bdb875f3f403c5bbbe0454dc774f569c848e935d4b4d01432046ac278e67a

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