Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f92c8aa43ab33d0…

MALICIOUS

PDF

34.4 KB Created: 2021-06-18 11:08:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bbadc1af5b8c076973e4470562a9f63e SHA-1: d8c565f82e1491b2e9e8fbd40fb046fc3a6830fc SHA-256: 8f92c8aa43ab33d08e473851c654cbe2cc8593a376bab0a0d637a518b098d598
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as "free Robux generators" and "game hacks" to lure victims. The presence of a download button heuristic further supports the malicious intent of directing users to external, potentially harmful content. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing or scam attempt.

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.co/app/431946152/free-robux-generator-for-pc-game-hack In PDF document text
    • http://io24.com.ar/images/cheat-engine-roblox-youtube_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/robux-boost_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/como-ser-hacker-sin-descargar-nada-en-roblox_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-free-shirt-not-model_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-robux-deutsch-legal_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/admin-hacks-roblox-ban-pll_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/pubg-uc-jazz-cash_GM1330123889.pdfIn PDF document text
    • http://io24.com.ar/images/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/ex7-roblox-free_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-hack-roblox-jail-break2021-money_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/freespins-coin-master_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-hack-roblox-players-2021_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-toys-codes-roblox-2021_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/my-roblox-account-was-hacked_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_off00002f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F44 22744 bytes
SHA-256: c97612b312d71b90bf3a1af4452ac91d14dc4e23bbc96fa1fdd6afa879b5a31d
font_01_sfnt_off0000624a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624A 18788 bytes
SHA-256: cf7c66d92fb6c3ca112ea24584e6d813b700acfcb6c99461aa4ff4ff2f3342a2