Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffc0f4305daa9c9…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 07:23:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 03d9c563ff2babd1119951e9773c31bd SHA-1: e448d91503f781618105613dbdf844e450f00e0c SHA-256: cffc0f4305daa9c92bb446059aeb8181516da88a871f8fad5c567c992249887f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure, designed to lure users into downloading potentially malicious content. The document body and embedded URLs suggest a scam related to game hacks and in-game currency. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure strongly indicate an attempt to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/online-coin-master-hack-here-game-hack In PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/roblox-jailbreak-money-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/working-robux-hack-windows-10_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-insert-scripts-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/auxs-roblox-hack-pack_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/800-robux-for-free-gamekit_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/dayz-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-do-u-get-roblocks-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-roblox-on-pc-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/stigma-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-hack-in-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/robux-win-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-robux-joshy_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/roblox-bee-swarm-honey-hack_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-1million-robux-for-free_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_002_off0000311b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x311B 22224 bytes
SHA-256: a8eb6bfdf20d3258cc3c0c9aab5b56f152ca3cae1a6f44a6f192481259981bdb
font_01_sfnt_off00006227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6227 18080 bytes
SHA-256: 9b8e948b254d81f42744a3713bd5e57e94ce20b378f0589ec816b2d02d355b2b

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