Malicious PDF — malware analysis report

Static analysis result for SHA-256 499bd12bbf0eaa48…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 18:23:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6cecf62f99fef5ec377f60ac95f4d609 SHA-1: 233215cbf87bb96c3ac2f16dbd647b07dea44574 SHA-256: 499bd12bbf0eaa48e2a560fb2625622706137a628e641407858d0104e0aee1f2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-robux-com-real-game-hack PDF link annotation
    • http://library.feb.unila.ac.id/rfeb/repository/dead-winter-roblox-credits-hack_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/get-your-free-robux-now_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/galaxy-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/console-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-hack-someone-home-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-free-stuff-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/hack-roblox-2021-roblux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/hack-cuentas-gratis-en-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/boku-no-hero-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-get-free-robux-my-money-safe-s_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-pro-hack-script_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/android-coin-master-hack_GM406889139.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_off00002fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCE 22716 bytes
SHA-256: 70308d8d42a5282d6a0fb2fb603eb158092ed5f50ff79d2ff254f2bdcd79a38b
font_01_sfnt_off000062a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A0 19052 bytes
SHA-256: bc7b269ccb6ae3a64d83fc270fb5f4e603085d94a09e100662dabde8c260ece0

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