Malicious PDF — malware analysis report

Static analysis result for SHA-256 312ccf7391be423e…

MALICIOUS

PDF

47.3 KB Created: 2021-05-10 17:06:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5e37cb2c2adbbd4d58c6ca04a864101f SHA-1: 948b5308fbb179f923cc15ca021cc1a241e5d484 SHA-256: 312ccf7391be423ee5e5b05db4d0b04187e2eb6c18203598ad0ef4bd0be5d00f
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive 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 0.9977

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/free-robux-with-no-verification-2021-game-hack PDF link annotation
    • https://www.mierepair.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/robux-rewards_GM431946152.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/free-800-robux_GM431946152.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/xray-hack_GM479516143.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/how-do-you-get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mierepair.com/uploaded_files/userfiles/files/free-minecraft-client_GM479516143.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_off00004c51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C51 31024 bytes
SHA-256: 8f40a32eed08e6ad67750e652431f94f38586c26b7fb74296bb373066fce9e96
font_01_sfnt_off000093cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93CB 19368 bytes
SHA-256: aac922b8691acc9aa277dffee065f580c863b50a75d1a5b8a64d6db85e21622d

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