Malicious PDF — malware analysis report

Static analysis result for SHA-256 884a4071da3f279e…

MALICIOUS

PDF

45.8 KB Created: 2021-05-13 10:12:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fe5dafead3aa0a301f903977acb1373a SHA-1: 8808eec201c1093ec158c95f465053c19e10a8c3 SHA-256: 884a4071da3f279e971afb8862f36bf24a55aab03d3412e335d0723c0c0a5b0b
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9432

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/free-coin-master-spins-2021-game-hack PDF link annotation
    • https://www.nema.go.ke/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/free-robux-picture_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/minecraft-116-free_GM479516143.pdfIn PDF document text
    • https://www.nema.go.ke/images/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/complete-offers-for-robux_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_off00004a34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A34 25772 bytes
SHA-256: 24e452280e051822765523c11b1ea07d071253695b85ad44189b4b33c6b8e91d
font_01_sfnt_off00008674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8674 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000905f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x905F 18288 bytes
SHA-256: cbf21fc5c11f74798808ab0cc71af5e4bf323ced5a050f8983f0748b8c809d88

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