Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a4d31fcbfd00ab…

MALICIOUS

PDF

49.6 KB Created: 2021-06-11 08:24:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 43ca5ecb230de1d4fe0a1a3858947f30 SHA-1: 5516bbf966df4cb799ec8f34c55489ad16ebc988 SHA-256: 21a4d31fcbfd00ab4e1af0a7c5f6cb561006f50cc7c7b874c50e3b2531173583
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to 'game hacks' and 'free generators' to entice users to click on embedded links. The primary link directs to a known malicious redirector infrastructure, suggesting an attempt to lead the user to a malicious site or download. While no scripts were directly extracted, the PDF structure and embedded links indicate a social engineering tactic to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/how-to-hack-roblox-accounts-may-2021-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/earn-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/mc-hacks_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-tix-bc-co-cc_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-phantom-forces-hacks-fly_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-knives-in-assassin-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/go-to-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005185.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5185 26464 bytes
SHA-256: 528cade112fc60b0b281c72435420103b6f953b338370a19f2f58740f242e0dd
font_01_sfnt_off00008e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E44 5756 bytes
SHA-256: 400ee760d8ba2af4a989a89998a708334648619bc88f048e6e7319998473a993
font_02_sfnt_off00009b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B9A 19368 bytes
SHA-256: b2025b509276967f8891d83a9b9ff07acf42e9bdbcaa58fab977f8a909f80e91

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