Malicious PDF — malware analysis report

Static analysis result for SHA-256 7793bdb1d8824263…

MALICIOUS

PDF

36.8 KB Created: 2021-07-09 19:46:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 103c744b66cd1892bd6a472d90fed740 SHA-1: 4ce9aab08016b4771d71ec75d58db04a8715ad0e SHA-256: 7793bdb1d8824263c824cbd16dff4ccf4f6b668a74b708e69d8d5b5d6f4c0235
180 Risk Score

Malware Insights

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

This PDF exploits a vulnerability to redirect users to malicious infrastructure, specifically a link promising game hacks. The document body and embedded URLs indicate a lure for free game currency or cheats, likely leading to further malicious content or malware downloads. The malformed stream length heuristic and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.tw/app/431946152/free-robux-games-that-actually-work-2021-game-hack In PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/play-roblox-free-online-no-download_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/robux-premium_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/hack-para-atravesar-paredes-en-roblox-2021_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/roblox-one-piece-millenium-hack-devil-fruit_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/which-pubg-uc-is-best_GM1330123889.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/roblox-space-outpost-tycoon-script-hack-2021_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/youtube-roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/ban-hack-roblox-moi_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/wurst-18_GM479516143.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/pokemon-go-update-free-download_GM1094591345.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/como-hackear-roblox-2021-robux_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/free-tiktok-likes-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://e-learningmtsn8nganjuk.com/__statics/gudangsoal/files/minecraft-hack-client-18-9_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
font_00_sfnt_off000034b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34B2 22652 bytes
SHA-256: e66b984c2fa7543f24b066df5edb1d799f5b2ce262d0ed1d913d142f14748548
font_01_sfnt_off0000673f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x673F 20272 bytes
SHA-256: 3dcbb05b4dce0a2bab4a10db55923dcb732eb0f4a2e9bcb9735c66d658b8cabb

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