Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bb19c5d32125dc…

MALICIOUS

PDF

48.1 KB Created: 2021-06-09 04:53:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 651265771f0487db47c3c21171f44f51 SHA-1: 7978639d6d728ccd0a273c853e06c5ffcda01a88 SHA-256: 26bb19c5d32125dcff845f59c2e2b4c916b2c507d092272d99881f4e97803536
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for 'free generator / game hack' content, directing users to a known malicious redirector. The presence of a fake CAPTCHA heuristic indicates an attempt to trick the user into interacting with the document, likely to trigger a download or exploit. The document body contains obfuscated text and embedded URLs that further support a malicious redirection and potential payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/darkrp-roblox-hacking-5-game-hack In PDF document text
    • http://schmittmusic.de/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://schmittmusic.de/images/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://schmittmusic.de/images/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://schmittmusic.de/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • http://schmittmusic.de/images/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/roblox-google-chrome-robux-hack_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://schmittmusic.de/images/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://schmittmusic.de/images/free-robux-legit-no-survey2021_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/how-to-hack-peoples-roblox-accounts_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_004_off00004fd6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD6 24784 bytes
SHA-256: d42c1bed20d0b2a78902a02c491f6d850edb85e27be715830754f8468dc39aed
font_01_sfnt_off00008830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8830 6100 bytes
SHA-256: f866077ce59d6ea276f75e4af76daa2aab5f3a1a679df144776123d85664d65c
font_02_sfnt_off000096bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96BB 19068 bytes
SHA-256: e665d443f82dcf35f30bd544ccab279e614243e01880f14e0c2a43a8f4c1a447

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