Malicious PDF — malware analysis report

Static analysis result for SHA-256 444bb37fe307e418…

MALICIOUS

PDF

32.6 KB Created: 2021-07-08 07:42:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e1ab06ba53815d78ed618fa06bd299cc SHA-1: f69a63e94fda06ffa737c30bb6b684f08317c1c4 SHA-256: 444bb37fe307e4181194a4eba399f4f342336f8ff8c27f15329f8b653e5e74b0
220 Risk Score

Malware Insights

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

This PDF document contains numerous links to external sites, including a known malicious redirector at http://netcdn.tw/app/479516143/play-minecraft-for-free-game-hack. The document body and heuristics indicate a lure for game hacks and generators, a common tactic for distributing malware or conducting phishing. The presence of multiple PDF links suggests a link farm designed to attract users through search engines. No scripts were extracted, but the embedded URLs and the nature of the lures strongly suggest a malicious intent to redirect users to potentially harmful content.

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/479516143/play-minecraft-for-free-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-live_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/comment-hacker-roblox-macbook-pro-franais_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-tiktok-likes-no-human-verification_GM835599320.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-free-modeler_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-a-weapon-on-roblox-hack_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins-promo-code_GM406889139.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_off00002c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C93 21680 bytes
SHA-256: e10842ced0ca7a261f641f69fcb9bc527d6e25439fb6d3493e73b763fd26063f
font_01_sfnt_off00005c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C49 18408 bytes
SHA-256: e98085965e533c73dc4e7df94380e68fafa549d02609d91f4df3d7f9fdc36519

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