Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb237e05d321472…

MALICIOUS

PDF

45.6 KB Created: 2021-05-15 06:06:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 21fe8b47579044e8a9efe70bb88d70d2 SHA-1: f4c31abcd221e51f2cee7201caa89d1b394087fb SHA-256: dfb237e05d321472be94c462337563a410f34acaa7b6d1805f4db87ddc84872c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency (Robux) and hacks to entice users. It contains multiple embedded URLs, including a primary malicious redirector at `https://netcdn.xyz/app/431946152/earn-robux-today-game-hack`. The document body and heuristics indicate a social engineering tactic to drive traffic to potentially malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.xyz/app/431946152/earn-robux-today-game-hack In PDF document text
    • https://emindonesia.com/assets/CKImages/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/master-coin-hack_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/is-it-possible-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-robux-no-verification-no-survey_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_003_off00004a56.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A56 25708 bytes
SHA-256: 8e636110f724cf57f16342d601ce829c0818003180083f766c4fa55abbd8538a
font_01_sfnt_off0000855b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x855B 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0A 18432 bytes
SHA-256: 50fc1adeb895ae30588f73a493889120d8bf728fc3821c38df9289c33b75de2a

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