Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcaac6c3485d1c42…

MALICIOUS

PDF

45.0 KB Created: 2021-05-15 02:11:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e303b5fc18152814c9b86f3100f96242 SHA-1: 5fb1955b388ecc10ae3e0fb3037befdbf25e0edc SHA-256: fcaac6c3485d1c426493f2cb9bb1dad89898367ccc837cf237527943ebdf86f0
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to websites offering "game hacks" and "free generators", a common lure for downloading malware. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/coin-master-hack-apk-game-hack PDF link annotation
    • https://bookswithapast.com/ckfinder/userfiles/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/robux-earning-websites_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn 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_off00004789.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4789 28996 bytes
SHA-256: 2884dc4cf8e754796ac399f4d2d4a092b83f596a2ffae6266be20233ae2a403d
font_01_sfnt_off000084df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84DF 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E90 17892 bytes
SHA-256: f939fda97690d6a809d743b342add8ec97984f5e978608423f32dd39679c4d64

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