Malicious PDF — malware analysis report

Static analysis result for SHA-256 21db6956cb011d67…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 10:06:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c24321801421d008aa16b5dc9819458e SHA-1: 098b0ef5c79c064c9a90971a39d25345c1c71f20 SHA-256: 21db6956cb011d67ec623a2598e29d234e4d4b40fbddb116e91d6f69974fd78d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically advertising a 'robux miner game hack'. The presence of these links and the lure of free in-game currency strongly suggest a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirector chain designed to lead users to potentially harmful content or further exploitation.

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/431946152/robux-miner-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-cheat-on-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-villages_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-pc-hack-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-hat-paclage-roblox-free-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/admin-hack-roblox-dowload_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/cool-avatars-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/cheat-pour-mad-city-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coins-master-hacks_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/instal-cheat-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-roblox-wikihow_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-someones-roblox-account-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F52 22604 bytes
SHA-256: 6d45b45a35f0912adee23bc7455109f935bb21feea1705b41fe93a7a1e4304a3
font_01_sfnt_off000061ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FF 18868 bytes
SHA-256: 183429bdbf7ecae0c18e50d403fb432c957990045bfe1c1dbf73e59a2b4bdc01

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