Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f38f5974b0e940e…

MALICIOUS

PDF

33.5 KB Created: 2021-07-04 03:40:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b4da5459b5abfae116f7e65bcf7f99f3 SHA-1: e61f28325b3e7070c60cbd4e34f9d8674eeb5bdc SHA-256: 3f38f5974b0e940e5b89de077c124fe57ee6d3f57db175ebc03598f52ee8a5bf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on what appears to be a 'free generator' or 'game hack'. The primary link redirects to malicious infrastructure known for hosting scams. The document body and embedded URLs strongly suggest a phishing or scam attempt related to in-game currency for games like Roblox and Coin Master. No scripts were extracted, but the PDF structure and embedded URLs indicate a redirection-based attack.

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-free-robux-generator-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/how-do-u-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-tr-808-vst-free_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/dinosaur-simulator-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/dowload-free-robux-hack-for-free_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/robux-hack-no-human-verification-no-survey-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/does-cheat-engine-work-for-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-free-login_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-promo-codes-list-free_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-retro-craftwars-script-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-no-survey-roblox-rubox-generator_GM431946152.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
font_00_sfnt_off00002d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D44 22112 bytes
SHA-256: f34f4f10c7b85770fe2214c3a77a3b1995079402c0f4049bc67c20de6c0f8ed2
font_01_sfnt_off00005e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E24 18896 bytes
SHA-256: a8435c37e47e08e896321e6274f2685d30d248d21a2818cac5b51dec603f27f9

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