Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c87a91e49c11a93…

MALICIOUS

PDF

42.6 KB Created: 2021-05-13 06:12:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: df39194e662ff9469db57a9d62e5adcb SHA-1: c182009ed09f60e76d71b19a00d493552e5aaf71 SHA-256: 3c87a91e49c11a93d78af9ab9637d17c302f73d8d388edc81dd5ec607edf1d75
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for game hacks and generators, directing users to a malicious URL. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/how-to-install-minecraft-for-free-on-ios-game-hack PDF link annotation
    • https://vierabyragazze.com/upload/files/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/get-free-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-website_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-invite-friends-hack_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/robux-in_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-demon_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hacks-for-gold-cards_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-no-human-verification-2021_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
stream_003_off00004bdb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BDB 25580 bytes
SHA-256: 990c2784eb2b414036caf0c09409529d210cb7d0010ba0e57bf90c1f569bb41e
font_01_sfnt_off00008572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8572 17948 bytes
SHA-256: 105e1adf3a8ec01b7ad4e3637eb20d748d74417b36eb8a9b6e8dc278cccf0612

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