Malicious PDF — malware analysis report

Static analysis result for SHA-256 f653229995c1b55d…

MALICIOUS

PDF

51.8 KB Created: 2021-06-03 22:11:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7fdfe065f35529b5c13c82dfc7eee293 SHA-1: 04269aa7f52fccbad0cdd38f335866112c92d83f SHA-256: f653229995c1b55d438addd03e15d0efec82f9ed1586dcac230bad5ae2d17b13
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a prominent link to a URL associated with game hacks and free currency, which is a common lure for phishing and malware distribution. Heuristics indicate the link points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/coin-master-free-daily-spins-and-coins-game-hack In PDF document text
    • https://www.bridalguide.com/sites/default/files/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/mc-update_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/grabpoints-robux_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000539f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x539F 24568 bytes
SHA-256: 18e06d4f129849dc5bc9aa9e6729a537126bf3c292d0e9ec72ca8a6327718e4b
font_01_sfnt_off00008b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5D 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off000094fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94FA 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_03_sfnt_off0000a712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA712 18480 bytes
SHA-256: 88c5a76ee56cb7e28b06cf9e90949f5a0fd4a72b6dddac6cb3c8c84aebf5620b

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