Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe8116b0afa2e9d…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 15:20:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d5e219eb79a28e4dfbbb4420c2f701f0 SHA-1: 4dbdad081168e954a1b2fffa764b78d17baf2557 SHA-256: cfe8116b0afa2e9d92c5503f677c93252dfbd4ea04f34d2bd58ce228615d3d65
160 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generators' or 'hacks' for games like Roblox and Coin Master. The primary redirect URL is http://netcdn.tw/app/431946152/roblox-robux-game-hack. This lure is a common tactic to trick users into downloading malware or falling for scams. No scripts were extracted, but the embedded links and heuristic firings strongly indicate a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/roblox-robux-game-hack In PDF document text
    • https://www.mb-alati.hr/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://mb-alati.hr/files/rbx-free_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/abd-roblox_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://www.mb-alati.hr/files/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • https://www.mb-alati.hr/files/roblox-online-free-unblocked_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://mb-alati.hr/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.mb-alati.hr/files/free-robux-obby-no-password-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/roblox-codes-to-hacke_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mb-alati.hr/files/hacks-roblox-gamepas_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/sharkbite-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.mb-alati.hr/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://www.mb-alati.hr/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://mb-alati.hr/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://www.mb-alati.hr/files/free-robux-generator-2021-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://www.mb-alati.hr/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED7 22096 bytes
SHA-256: b7c6c773cf6680646941dadf368f2e6fc8a8c7aca273f182b970eb739838f807
font_01_sfnt_off00005fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD4 18628 bytes
SHA-256: 91fe40ca7b1c63e097b3ed98f551f0053b3fa477182f2dddb1f8374deacdf7be

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