Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f47c9c809db86d…

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 10:59:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e28ac682584221d747d35415962c6d94 SHA-1: b229b665a8d87972bee2370fd406b23c25b159e6 SHA-256: c8f47c9c809db86d19acb57e5dbc47c7c7d71f192ed6256137c75ff566e65061
160 Risk Score

Malware Insights

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

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free Robux'. The primary malicious link identified is https://netcdn.online/app/431946152/how-to-hack-roblox-to-get-robux-game-hack. The document's structure and embedded links suggest it is designed to trick users into visiting these sites, likely leading to further malware downloads or scams. No scripts were extracted, but the PDF's nature and the heuristic firings strongly indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/how-to-hack-roblox-to-get-robux-game-hack In PDF document text
    • http://opac.stieimalang.ac.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/pokemon-go-free-mewtwo-hack_GM1094591345.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-no-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
stream_004_off00004f8b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F8B 28876 bytes
SHA-256: 8b5a087a2929ff475bfc226b5ed6f10efa1336324adc44b45ee0b95b0e0665b0
font_01_sfnt_off00009454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9454 18588 bytes
SHA-256: 6723e17a0e3ea7e17da9fa5ee91cb22fe0fa4706a6f3d09ae44dda015c08872b

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