Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb28fa84fe4403b…

MALICIOUS

PDF

36.5 KB Created: 2021-07-01 10:40:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e913827c8003617604affedd970a62f5 SHA-1: e40ae41d64c147f0ff838c3dbe968b4fb6a152f2 SHA-256: ecb28fa84fe4403b1b18cbc5398d6b77423ff8a71a33f4fa3e5f6e405723ed33
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 'game hacks' and 'free generators' for Roblox. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a redirector lure. While no scripts were explicitly extracted, the embedded URLs and the nature of the lure suggest an attempt to trick users into downloading potentially unwanted or malicious software.

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.co/app/431946152/top-cheat-limited-u-on-roblox-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/cheats-for-roblox-rocitizens_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-make-a-roblox-hack-your-own_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hacks-to-get-in-people-acounts_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-through-roblox-walls-in-the-streets_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/final-stand-2-hack-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/freecoins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/exploit-engine-roblox-free-no-virus_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-assasin-hack-script-2021-unpacthed_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • https://www.roblox.com/my/tasksIn 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_off0000347c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x347C 23020 bytes
SHA-256: 0564a7a23111f1f34cf008757dbbcc49321d5a718b4cd2c9645f4b2b82e626d1
font_01_sfnt_off00006877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6877 19484 bytes
SHA-256: 801cafb9e4fb7dea9a6316726cc108d397fd7fcb29165a80bb060c22b628a89e

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