Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78fcaf1b03486d4…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 01:29:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 045ece94dbea5edd033be2edec310e68 SHA-1: 69da196dd178f209643c89465f10615be4d963ab SHA-256: b78fcaf1b03486d4a2e3e52416857522adf6a9925f5c4b8986012a719b7f6b65
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free in-game currency to entice users. It contains multiple links, including one pointing to known malicious redirector infrastructure at http://netcdn.tw/app/431946152/games-that-can-be-hacked-game-hack. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or further stages of an attack.

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.tw/app/431946152/games-that-can-be-hacked-game-hack In PDF document text
    • http://www.eucorro.com/arquivos/files/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-hack-robux-420-apk_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-icu_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/landonrb-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-enter-paid-games-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-hacking-roblox-tutorial_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/pubg-uc-rate-in-india_GM1330123889.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-latest-version-free-download_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-hacked-places-free-download_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA4 21932 bytes
SHA-256: be8ef282609f8ddd91b4b36203c01c4ee399c9b80a89223501c1dcb77a305b49
font_01_sfnt_off00006037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6037 18776 bytes
SHA-256: c043326b32e9d44158bac6e99eb248c2f97816695cbd5054f46ff6cdd58d7864

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