Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b35579571a5ecd…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 02:22:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 23d314c91d1bc50342aa27fbc685c468 SHA-1: e532895759bbd63df75e3c4787c6b8bbbb87e415 SHA-256: f9b35579571a5ecdd6a854348dcf0f812d2f0640c829e5a99eb2bd554db9fda7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 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/406889139/50-free-spins-coin-master-links-game-hack PDF link annotation
    • http://www.stttekstil.ac.id/elib/repository/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-visual-cheats-script_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-obby_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/is-it-possible-to-get-hacked-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/youtube-roblox-how-get-free-animation_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-change-roblox-name-free-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/welcome-to-roblox-building-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-funny-t-shirts-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-websites-no-password_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/best-free-exploit-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-booga-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-hack-discord_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-ios-app_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_off00003008.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3008 23016 bytes
SHA-256: 3d8f13c618b508c498ee15a2de03554d2cec293705adbe6789778e10b3bd5b07
font_01_sfnt_off000063e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E5 18648 bytes
SHA-256: 7cb7b4aa4fe43c538a35ca12efa1607bb190a4a0226e989e68a2df4e99bf3741

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