Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccbfaff37de47bb…

MALICIOUS

PDF

33.6 KB Created: 2021-07-03 22:11:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 369843265d60d305cc3c30799ad8afad SHA-1: 32d08b8142714a8f50d82afb4fa15a480f28236d SHA-256: fccbfaff37de47bb30fc1ae3e10dfa0aecfe5d08dd9cfaa3fae0c1b3e71cdbe9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF document employs a common lure of free game hacks and items to trick users into clicking malicious links. It contains numerous links to redirectors and SEO link farms, indicating a phishing or scam campaign. The primary malicious URL identified is http://netcdn.tw/app/431946152/ghost-walk-hack-roblox-game-hack, which is part of a known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/ghost-walk-hack-roblox-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-giftcard-code_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-hack-robux-easy_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/wie-bekommt-man-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/dungeon-quest-free-account-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-cheats-in-roblox-jail-break_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-blood-moon-tycoon-auto-rebirth-hack_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/born-to-hack-roblox-group-logo_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_off00002d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D1F 22016 bytes
SHA-256: c85fd0f5ad929eed338f06668e3ef326d4a3a0f7938e1364eee3296a663b456f
font_01_sfnt_off00005dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEA 19124 bytes
SHA-256: f35521ef66daadba3130d0be524c45b293a176b137f9228a52a8c8f3803c9fa8

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