Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c81041e1aa8f104…

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 14:18:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 654529296840b0dc634afc4582e0f870 SHA-1: 8f8656af12833e913d92ea5680201afd1207962c SHA-256: 4c81041e1aa8f104e8c2670522bf98fe71b449979aaed0eb4b402eebf84060ca
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a primary link to a site offering 'free coins and spins for Coin Master game hack'. This lure, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious workflow, likely involving redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/406889139/free-coins-and-spins-for-coin-master-game-game-hack PDF link annotation
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pokemon-go-free-money_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/oprewards-robux_GM431946152.pdfIn 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_004_off000051a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A1 25188 bytes
SHA-256: c07c1c7faf3183b55dbb95ede120423697e92150e42964ace53b73cb0076d27d
font_01_sfnt_off00008ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD1 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off000094bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94BC 18320 bytes
SHA-256: 2c95db8d02702652075be8f6568e083e0c31fb28563b2fbbcaccc1dd0c48c672

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