Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bd6fefc9cd5ecd…

MALICIOUS

PDF

47.3 KB Created: 2021-05-15 02:58:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 351a0bf4df017b8cc23fc8e6e77c0a33 SHA-1: 21ee51eda8f3e6cd7334a03194de6bee96584ac0 SHA-256: 98bd6fefc9cd5ecd06d726270c67cf3d822a4d552b29f3ad92df6d1fa603ef2e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a lure for 'game hacks' and 'free generators', strongly suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. The embedded URLs likely lead to a second-stage download or a malicious website designed to trick users into providing information or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/431946152/rewardrobux-com-game-hack PDF link annotation
    • http://mechanism.gr/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-official-website_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/rbx-website_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-hack-ios-2021_GM406889139.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_off000048d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48D4 26692 bytes
SHA-256: 4abf44d0d546874f60690264f3de1dde17f744c30083b8358343e69208db7a54
font_01_sfnt_off00008512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8512 4660 bytes
SHA-256: b8980cdac4d025496d9fe039d8c05bb5b9bae1b804244a1f9c05e9663db72816
font_02_sfnt_off00009523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9523 18676 bytes
SHA-256: 7669e564bd091b207fd11e388173a1fc76ed62ef873f42ab23981861f0020ac0

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