Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf75fb3cb3d9d8e…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 12:44:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 477efe81f9e02cc51fb9252b29ba2eb0 SHA-1: b1d200a9666ae1fd4607649bec044a67ff0ad0dd SHA-256: acf75fb3cb3d9d8ef993c9b2bea89762d4b1ce545db787adff38322e3e2daad7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a 'free generator / game hack' which redirects to a malicious URL. This URL, in turn, leads to the download of another PDF, suggesting a multi-stage attack. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the embedded URLs are strong indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/431946152/roblox-generator-com-game-hack PDF link annotation
    • http://perpustakaan-stikesmsb.com/repository/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/rbxdemon_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/robux-today_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/minecraft-wurst-client_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-coins-and-spins-in-coin-master_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_004_off000050b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B1 25304 bytes
SHA-256: e79238aee8a8f76d9c1310b3f2a9d720380e01ae14aac1fe7b63aae743016e07
font_01_sfnt_off00008b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B85 18376 bytes
SHA-256: f82f7cd631513f9855343e536b8ab499af2fdb27f4ce1349c9137e16bc695ffd

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