Malicious PDF — malware analysis report

Static analysis result for SHA-256 71aa32e1cb327426…

MALICIOUS

PDF

45.5 KB Created: 2021-06-03 09:49:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 22884fab7e220cf8c1dc18fbe0c32234 SHA-1: f79726c8a16fddbcae5f6651441318f79c95a11e SHA-256: 71aa32e1cb327426029eb05af511de53b612ac54350f1be37af981c75bb61476
260 Risk Score

Malware Insights

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

This PDF document contains multiple links to external sites, many of which are part of a link farm designed to attract users searching for game hacks and free currency. The document body and heuristics indicate a lure for 'free Robux' or similar game-related cheats, likely leading to a phishing site or a download of a second-stage payload. The presence of a fake CAPTCHA prompt further suggests an attempt to trick the user into performing an action that could lead to compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.online/app/431946152/how-to-get-free-robux-on-roblox-2021-game-hack In PDF document text
    • http://ggmtc.net/userfiles/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/why-cant-i-upload-audio-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-scam_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/minecraft-toys-for-free_GM479516143.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_004_off000052be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52BE 25868 bytes
SHA-256: 4f4988e933e1a3517c7675b530af3cf85fbdc40b64ebf179c6835860cac1e8e7
font_01_sfnt_off00008d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8D 18756 bytes
SHA-256: 57ee29ca2df633c9559bea9da81b447a7ef2e0dffb4d388bdd233aaad46b31ec

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