Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbf87459c76bdf4…

MALICIOUS

PDF

33.5 KB Created: 2021-07-06 10:58:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cbbd5310cc61d46a0ae5c054b95a7a8e SHA-1: 99301a028bc3f093ce9f6fb2a77bbdc660ee0929 SHA-256: 0fbf87459c76bdf4ff4b3a854dd64b09dd998f4ff5e0834571b3905b5f2726c3
142 Risk Score

Malware Insights

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

The PDF contains numerous links to websites that promise game hacks and generators, indicating a lure for users interested in cheating or exploiting games. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of such links were generated, likely for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the nature of the links and the ML classification strongly suggest the PDF is designed to redirect users to potentially malicious sites that could host further exploits or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/how-to-o-get-free-coin-master-spins-game-hack PDF link annotation
    • http://ggmtc.net/userfiles/files/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-mafia-cloth-free_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-bus-simulator-hack_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-jailbreak-hack-client-we-are-devs_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-obby-limited-time-only_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-apocalypse-rising-script-hack_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/get-free-gold-cards-in-coin-master_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
stream_002_off00002ea1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EA1 22192 bytes
SHA-256: 4fec15e1e4dc600ff388a4ce87baa48f7903da9d56469cb07703410a3096f98d
font_01_sfnt_off00005ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF7 18336 bytes
SHA-256: 88fb275224d01e2fb2ba19e8488dcc02f674101147b00fcd4e979f6cbde2f727

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