Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c74449382a0723…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 17:02:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8eabc28d5f0c718ab10e73d3bbba1082 SHA-1: 2a1a522ae73c6d492a2e8b942b1543b53b9e225e SHA-256: b2c74449382a0723c295d2ce662d2ba4ed1e5efad84ee467326870846b3a6e31
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The primary malicious URL identified is http://netcdn.tw/app/431946152/how-you-get-free-robux-game-hack. This lure is a common tactic to entice users into clicking through to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector designed for user engagement and potential further payload delivery.

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/how-you-get-free-robux-game-hack In PDF document text
    • http://library.darmaagung.ac.id/repository/hack-of-getting-free-robux_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/free-admin-roblox_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-hack-into-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/hack-cliens-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/www-robux-com_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-hack-roblox-jailbreak-noclip-2021_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-roblox-sound-effects_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/hack-robar-cuentas-de-roblox-2021-akakaa_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-hack-on-ipad-roblox_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/download-robux-hack-no-downlowdes_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/roblox-online-hack-tool-no-survey_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/como-hackear-roblox-2021-espaol_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/roblox-rs-hack-download_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_off00003367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3367 22824 bytes
SHA-256: 129b5afef4a90e66fb135955a56bd3c317d1cfd4bdc912188faef763fab416ce
font_01_sfnt_off00006656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6656 19144 bytes
SHA-256: 347a02abbc70d9a51f290361347438ae6cbd927e0a0fbf4b37ccbc96466cb725

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