Malicious PDF — malware analysis report

Static analysis result for SHA-256 51855e4b6c7737e8…

MALICIOUS

PDF

34.4 KB Created: 2021-06-20 01:59:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8a12f3655efc39797b9befc6bbf49107 SHA-1: 00742c04c99f7ce8b322b7685b6fc870623c610b SHA-256: 51855e4b6c7737e8cfb6c47d9e5e873f42d359f617eb8e5d719d9f1ef45ab65e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to a known malicious redirector, masquerading as a 'free generator / game hack'. The document body and heuristics strongly indicate a lure for users seeking in-game currency or cheats, which is a common social engineering tactic. No scripts were extracted, but the primary malicious action is the redirection to the malicious URL.

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-robux-apk-game-hack In PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-cheat-engine-bypass-november-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/hacks-for-royal-high-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/eclipse-roblox-hack-injection-failed_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/150-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-free-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-high-school-how-to-fly-for-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/ad-why-cant-have-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/veil-roblox-exploit-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-free-unlimited-robux-and-tix_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-vip-pass-roblox_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_off00002fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA9 22372 bytes
SHA-256: d5f33a1837f75ebd43161da568430eb103f177e0e3f9c00e046aba5686ec36df
font_01_sfnt_off00006153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6153 19064 bytes
SHA-256: e83e6ec4c124ed2d7ca7106d3550dd0cc1129fb3ff046dea9d423b5a0bd21ead

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