Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87bc80e0933af04…

MALICIOUS

PDF

46.1 KB Created: 2021-06-13 20:20:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8c6b9c6480755ade031efe5dcc896f28 SHA-1: 2327e1ba66459e12dfed9fdaeccbd816557227f1 SHA-256: a87bc80e0933af04b5361c9b9aa1be7797b6b3aff18bb84e3a8cda45fed7d49f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, with a high-confidence heuristic identifying a lure related to game hacks. The ML classifier also flagged the document as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to redirect users to malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.co/app/431946152/comment-hacker-un-roblox-game-hack PDF link annotation
    • http://eurosystemssrl.it/images/free-script-runner-roblox_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://eurosystemssrl.it/images/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://eurosystemssrl.it/images/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://eurosystemssrl.it/images/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/roblox-cash-free_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/tiktok-free-wifi_GM835599320.pdfIn PDF document text
    • http://eurosystemssrl.it/images/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/coin-master-hack-2021-without-verification_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/real-robux-codes_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-robux-real-working_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_003_off00004748.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4748 25692 bytes
SHA-256: 9954513687280ecdc3f964ace1a73959536b6d228bbac3c34ea6567037f0c7ba
font_01_sfnt_off00008311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8311 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9022 18732 bytes
SHA-256: 2166c7aef55b232f549f9d37d093a164cb278701f55a32c2b53acb80f673d828

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