Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1e0a3aeebbdd3e…

MALICIOUS

PDF

45.3 KB Created: 2021-06-10 21:11:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a48cdd4e87e9a56418b45aa79e4f931f SHA-1: d3a545218a2e9b7db26bdd4fb270d9445310196d SHA-256: ef1e0a3aeebbdd3e930233dc1e54afcc8a0845ba37a85590172e2290a38d8c7b
160 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to malicious infrastructure, disguised as a game hack generator. The heuristic firings indicate that the document is designed to lure users into clicking these links, likely to download further malware or exploit vulnerabilities. No scripts were extracted, but the presence of embedded URLs and the nature of the lure suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/game-hacked-decal-roblox-game-hack In PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/free-promo-codes-roblox-november-2021_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/how-to-hack-ghost-simulator-in-roblox_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/cheats-max-com-roblox_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/speed-hack-roblox-2021-may_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/robux-hack-apk-2021_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/what-to-do-if-your-roblox-account-gets-hacked_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/deploit-hack-roblox_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/free-catalog-roblox-2021_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/free-roblox-promo-codes-2021-not-expired_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/how-to-get-free-robux-items_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/robux-para-roblox-gratis-hack_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/roblox-restaurant-tycoon-free-money_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/free-robux-2021-youtube_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/hack-skybox-roblox_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/free-likes-for-tiktok_GM835599320.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_off00005164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5164 26176 bytes
SHA-256: 2fc745ff42b12f0cd9545721b42e9d91c72705401109e365963b19d1d9d36f2a
font_01_sfnt_off00008d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D10 18784 bytes
SHA-256: 9db75500db0b56581d45ab7297ad473745f6fe0990f571e8f721a91c0239e68e