Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0ae6200af1804c…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 11:41:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ae28b34007ff4d5d98a267088e184aa3 SHA-1: 83b984e10437963a8dc687450dd2f93eae16548d SHA-256: de0ae6200af1804c48f582129e54da809326d12caeb8249af99daf1246d0f75e
200 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector lure, specifically targeting users interested in game hacks and free currency for games like Roblox and Coin Master. The primary URL, http://netcdn.tw/app/431946152/how-to-hack-to-get-robux-game-hack, is identified as a malicious redirector. The document body, though partially garbled, reinforces the lure of game hacks. The presence of embedded URLs and the ML classifier output strongly suggest malicious intent, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-to-hack-to-get-robux-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-cheat-in-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-coin-master-glitches_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-obby-no-password-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/play-roblox-for-free-unblocked_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-bc-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robux-hacks-real_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robloxcom-robux-and-tix-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pin-robux-hack_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_off000031c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C9 22956 bytes
SHA-256: 8fbc7de17af1b3398f5da7f1b6cbb67aaea8bc0e317f276b76379dc91cac6168
font_01_sfnt_off00006531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6531 18992 bytes
SHA-256: 689b3580a88e4ac2b5c71224fd8e7c25284750e13a7ef80e9d6f951111b623c5

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