Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1aa0d495db6b60…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 12:03:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9d28f25820b0ebef22d8b243ba17b4b2 SHA-1: 152ad23e9dece68e8e83bf2b9f16f38768507c64 SHA-256: 4d1aa0d495db6b60a68c1462230a1f5c03d955fc85fe172eb89955dc84bf7650
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based 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 0.9980

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://netcdn.tw/app/479516143/can-you-host-a-minecraft-server-for-free-game-hack PDF link annotation
    • https://hullerkopipagaralam.com/ckfinder/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://hullerkopipagaralam.com/ckfinder/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://hullerkopipagaralam.com/ckfinder/userfiles/files/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • https://hullerkopipagaralam.com/ckfinder/userfiles/files/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://hullerkopipagaralam.com/ckfinder/userfiles/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://www.hullerkopipagaralam.com/ckfinder/userfiles/files/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • https://hullerkopipagaralam.com/ckfinder/userfiles/files/speed-hack-using-check-cashed-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.hullerkopipagaralam.com/ckfinder/userfiles/files/outfit-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.hullerkopipagaralam.com/ckfinder/userfiles/files/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hullerkopipagaralam.com/ckfinder/userfiles/files/generateur-robux-free_GM431946152.pdfIn PDF document text
    • https://www.hullerkopipagaralam.com/ckfinder/userfiles/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • https://www.hullerkopipagaralam.com/ckfinder/userfiles/files/free-robux-codes-2021-mai_GM431946152.pdfIn PDF document text
    • https://www.hullerkopipagaralam.com/ckfinder/userfiles/files/roblox-hack-with-cheat-manager_GM431946152.pdfIn PDF document text
    • https://www.hullerkopipagaralam.com/ckfinder/userfiles/files/pokemon-go-no-free-box_GM1094591345.pdfIn PDF document text
    • https://www.hullerkopipagaralam.com/ckfinder/userfiles/files/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://hullerkopipagaralam.com/ckfinder/userfiles/files/how-to-sell-stuff-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://hullerkopipagaralam.com/ckfinder/userfiles/files/roblox-pokemon-brick-bronze-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.hullerkopipagaralam.com/ckfinder/userfiles/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://hullerkopipagaralam.com/ckfinder/userfiles/files/free-robux-without-verify-2021_GM431946152.pdfIn PDF document text
    • https://hullerkopipagaralam.com/ckfinder/userfiles/files/tiktok-free-view-year_GM835599320.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
font_00_sfnt_off00003216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3216 22020 bytes
SHA-256: c98550bf95bfc821f1ade99118397345bad1766f21dbb4b60146472a3e95121b
font_01_sfnt_off000062ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62AE 18416 bytes
SHA-256: 441f603c70f76477190c3697d348d70a2c9b8049fc674739932ccc54fe89fe5f

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