Malicious PDF — malware analysis report

Static analysis result for SHA-256 83676d8528e8c6f3…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 14:34:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5a2208300a5a57f05a192be944ec685e SHA-1: 6c45ee11be5dd19dff785dd06b9566617a5f6aeb SHA-256: 83676d8528e8c6f350ce37f8b9fb80b23ffac261551ef08b535e2697f499e86a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, including one identified as a malicious redirector for a 'game hack' lure. The document body reinforces this by displaying the same URL and related terms like 'free spins cheats'. The ML classifier also flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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.tw/app/406889139/coin-master-free-spins-cheats-game-hack In PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-aimbot-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-robux-no-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/cant-go-to-a-room-in-free-draw-roblox_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/no-human-verification-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/coinmaster-com_GM406889139.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/how-to-get-free-money-roblox-vehicle-simulator_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/play-roblox-on-google-for-free_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-printable-roblox-coloring-sheets_GM431946152.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mescosa.com/uploaded_files/userfiles/files/coin-master-hacks-no-surveys_GM406889139.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_off00002fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC8 21968 bytes
SHA-256: 918727320e25f73532213092879986998287a07edb231d37df6cf5e2de7405d9
font_01_sfnt_off00006014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6014 18340 bytes
SHA-256: 31b040f11d31e2c25a3918167828aea55bdad87c8eae0a9348126ed232a1d2b9

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