Malicious PDF — malware analysis report

Static analysis result for SHA-256 21aed14674cf109d…

MALICIOUS

PDF

33.6 KB Created: 2021-06-29 03:55:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 064ed14b262fd410eb5f1f323ee08c78 SHA-1: 080f79e01efa65eba92ddd66d07cfc2342362792 SHA-256: 21aed14674cf109d496d8ada286115e335336da7e4914cd9b096f59902be9d5a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a redirector lure. The document body contains the malicious URL, suggesting an attempt to lure users to a potentially harmful site.

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/431946152/1x1x1x1-roblox-hacker-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-mojang-account-with-minecraft_GM479516143.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/hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-hack-2021-august_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/tiktok-free-comments_GM835599320.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-use-pastebin-hacks-to-swear-in-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-fly-hack-2021-download_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-greg-hacker_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-free-bodys_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
font_00_sfnt_off00002ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA3 21908 bytes
SHA-256: e9c01bc53e1703f9cdf51afd0a8a4a1bac292944614b7d124a04548b4cf05963
font_01_sfnt_off00005ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECD 18760 bytes
SHA-256: ca1c8aad882b2e5882c575faefc976a8df17e205f08cc0f2bfe314b802610ca5

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