Malicious PDF — malware analysis report

Static analysis result for SHA-256 858121b1de132908…

MALICIOUS

PDF

44.4 KB Created: 2021-06-11 04:18:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ff41c5dcdfb9c60d1df75039f77ddc04 SHA-1: e950c8bc5468ab3dee0e6c5de04c32d6f1d8d787 SHA-256: 858121b1de1329082868f0f1389316bc141939e081dd9a394fd85468a59688dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to game hacks, specifically for Roblox, directing users to a suspicious URL. This URL, 'https://netcdn.tw/app/431946152/roblox-how-to-cheat-in-currency-in-games-2021-game-hack', is likely a gateway to a malicious payload or phishing page. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/roblox-how-to-cheat-in-currency-in-games-2021-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/can-roblox-detect-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-synapse-hack-download_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/moana-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/can-you-get-hacked-on-roblox-when-giving-dis_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/is-minecraft-realms-free_GM479516143.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_off00004e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E1A 25220 bytes
SHA-256: 88f140a8b2ccc7c7e30a1e5bb27bb407acc91207dd9fbc1800285e63d92c0472
font_01_sfnt_off0000876d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x876D 19428 bytes
SHA-256: 2052adbfc0e17a66568d4b7cc7a98ba529ddd8d08e72007fd36e77459ac56f5b