Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55ae6ca28c2d5aa…

MALICIOUS

PDF

47.5 KB Created: 2021-05-15 03:33:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d1830ef00899592870e3a073a16e74ef SHA-1: 3c939ee9a215b784351cfa34a42a70d7e65d78e5 SHA-256: c55ae6ca28c2d5aa6439c24bb213f7f1b6a9e07534a1931c92d778f4dd696dce
220 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA, suggesting an attempt to trick users into visiting scam websites or downloading further malicious content. The ML classifier also flagged this document as malicious. While no scripts were directly extracted, the embedded links and the fake CAPTCHA heuristic strongly indicate a malicious intent to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.xyz/app/431946152/freerobuxhack-us-2021-game-hack In PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/wurst-112_GM479516143.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/robux-boost_GM431946152.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/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_003_off00004c84.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C84 27184 bytes
SHA-256: 1e79de9c5c3199ad0b5485c27ab5ee9b2bf2a73fd67a9712570a99457f6863b6
font_01_sfnt_off00008aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AED 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off00009487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9487 19168 bytes
SHA-256: efb3faf8613e574aaafbc2c03eecac9d279c27a31d34e4d9725215b9c75db868