Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39007305604b5a1…

MALICIOUS

PDF

46.7 KB Created: 2021-06-11 07:11:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b477d78bf2fb885efd51e24899fa44c4 SHA-1: 416e545caee73b707646665b621ccacaa135030c SHA-256: f39007305604b5a1f31c6ef489764806eb6de1a027be60b4f629523fc387bd45
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary malicious URL identified is https://netcdn.tw/app/431946152/roblox-free-robux-promo-codes-2021-game-hack. This indicates a social engineering tactic to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded URLs and the nature of the lures strongly suggest a phishing or scam attempt.

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.tw/app/431946152/roblox-free-robux-promo-codes-2021-game-hack In PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/how-to-get-25-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/roblox-client-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-robux-youtube-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/make-a-free-roblox-account_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/roblox-how-to-hack-groups_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/roblox-xbox-360-free_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/hilton-hotel-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/hack-magic-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/hack-mining-simulator-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-roblox-game-card-get-your-code_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-spins-coin-master-2021_GM406889139.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_off000051cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51CF 27720 bytes
SHA-256: b4056c83c06088582190533876d9f5a5910d46ed21be23e13449c2392524edc9
font_01_sfnt_off000091a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91A0 19080 bytes
SHA-256: 971e125702c50f54b8f5f459a18b1c0bbece0a4bf5c67074622c0a287e86b70a

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