Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7bfff855739f03…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 22:23:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5a275d1ba88f8600409eb81a4f03c8d8 SHA-1: 4971ff4290f5e0a791ad08a6295a4d0d74af53d6 SHA-256: cf7bfff855739f036d175b32c765c1030afd532527f1eea0da710875e0fab7e9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators' for Roblox. The document body and heuristics indicate a lure designed to trick users into clicking these links. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aiming to lead the user to a potentially harmful download or exploit site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/hacking-apps-for-roblox-game-hack In PDF document text
    • http://perpus.ar-rum.ac.id/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/robux-gainer_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-generator-2021-no-human-verification-or-survey_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_off00004fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA2 25644 bytes
SHA-256: a956916d1624c5ffa96bc5209b4025e9ea3f6a7fe74b12362db5e4b10fd91112
font_01_sfnt_off0000896a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x896A 18932 bytes
SHA-256: a12a900017875743d46ad83be25c63e25fa00e3014bd6d438c4b8f248ab77b0b

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