Malicious PDF — malware analysis report

Static analysis result for SHA-256 443c648dc14c97cf…

MALICIOUS

PDF

42.7 KB Created: 2021-05-10 23:08:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c83ac2e81f5517e0f0cf70d18e443b2c SHA-1: 6e0b6fac64633fecc48c6289b24cfe5595211358 SHA-256: 443c648dc14c97cffed15296d885d01c9a4a4565074818255749fc67f4f19557
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, disguised as game hacks or free generators. The document contains numerous links to external PDF files, many of which are SEO-optimized and lead to potentially malicious redirectors. The primary malicious URL identified is https://netcdn.xyz/app/431946152/roblox-army-free-robux-game-hack, which is associated with redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/roblox-army-free-robux-game-hack In PDF document text
    • http://library.darmaagung.ac.id//repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/robux-claimer_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/como-descargar-coin-master-hackeado_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_off00004b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B07 24752 bytes
SHA-256: a4b6921f2318a548affe95e911dac35373b2e6b06c56b9fa260d5d5364dc9dd6
font_01_sfnt_off00008410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8410 18528 bytes
SHA-256: 3fb3182e9b0518fecce2d6326c4443e9fc052433b5a2fc23416796f92e2510b3

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