Malicious PDF — malware analysis report

Static analysis result for SHA-256 d838db3a40fcfc4a…

MALICIOUS

PDF

41.7 KB Created: 2021-05-15 10:35:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fe500bb4bbf0cfe8d2daf7550a57e85b SHA-1: def8225fb6057f5125a7067c9aca1f3daf3b4bc3 SHA-256: d838db3a40fcfc4aa5826ce93fc384603c5dff0779995ef5343e31f33f766189
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/479516143/mcpe-hacks-game-hack.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/mcpe-hacks-game-hack PDF link annotation
    • https://www.ncscolour.no/images/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • https://www.ncscolour.no/images/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://www.ncscolour.no/images/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://www.ncscolour.no/images/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ncscolour.no/images/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://www.ncscolour.no/images/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • https://www.ncscolour.no/images/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ncscolour.no/images/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • https://www.ncscolour.no/images/easy-robux-com_GM431946152.pdfIn PDF document text
    • https://www.ncscolour.no/images/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • https://www.ncscolour.no/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://www.ncscolour.no/images/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • https://www.ncscolour.no/images/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • https://www.ncscolour.no/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://www.ncscolour.no/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://www.ncscolour.no/images/dailyrobux_GM431946152.pdfIn PDF document text
    • https://www.ncscolour.no/images/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ncscolour.no/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://www.ncscolour.no/images/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • https://www.ncscolour.no/images/coin-master-hacks-for-iphone_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
stream_003_off00004926.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4926 25560 bytes
SHA-256: 7b2a87284cf353c48ce2283dc500ff1833305124e366f3ec1646ac975e451d18
font_01_sfnt_off0000829d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x829D 17688 bytes
SHA-256: d1508d2be7a9f8c5142932648003dcb14e924db67a920ae6fa1417f4aaab4b4b

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