Malicious PDF — malware analysis report

Static analysis result for SHA-256 db31094e37494ecf…

MALICIOUS

PDF

36.1 KB Created: 2021-07-05 00:35:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1f5755f6db67368671e01dd03ee0ba27 SHA-1: aba46ad0705964446d1383433712e37db17691d7 SHA-256: db31094e37494ecfec64768ca39341cea6421fd37314e2bea3d56039681ed066
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a lure related to game hacks and free spins, strongly suggesting a phishing or scam attempt. The primary URL, http://netcdn.tw/app/406889139/free-spin-coin-master-link-download-game-hack, is likely used to deliver a secondary payload or redirect to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely related to social engineering for credential theft or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-spin-coin-master-link-download-game-hack PDF link annotation
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/lumber-tycoon-2-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/cheats-for-roblox-2-player-wizard-tycoon_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/my-roblox-account-has-been-hacked-and-changed-my-email_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/hack-coin-master-online_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/hack-roblox-pc-download-no-clip_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/hack-roblox-simulator-de-levantamiento-de-pesas-3_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-hack-roblox-accounts-2021-on-ipad_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-hack-apk_GM406889139.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_002_off000033f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F4 23228 bytes
SHA-256: c76038031d9f5edaff1f9f41d9dcdf1cc514a6dce6055cf957f6c4b1a50d53f2
font_01_sfnt_off00006883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6883 18924 bytes
SHA-256: 03306dc9e1d9b52221a0aa79eae91509ea9ef63d9a812f23220c627d140f216f

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