Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50b4e596f240b5f…

MALICIOUS

PDF

44.8 KB Created: 2021-06-07 12:04:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e52c1e082bd86a1a37f0e50f1c9e0d77 SHA-1: 4a463a85f6e7e90f4b03b118ab0c4d7783b0bdab SHA-256: c50b4e596f240b5f282192574e3f2e1b50715d1daf5280c65905a8ccea425434
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirector infrastructure, masquerading as game hacks or generators, which is a common lure for phishing or malware distribution. The heuristic firings indicate the document is designed to trick users into clicking malicious links, potentially leading to credential theft or further exploitation. No scripts were extracted, but the embedded URLs and the MFA lure heuristic suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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-hacks-download-free-dll-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/rewardex-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/worst-roblox-avatars_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
stream_004_off00005120.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5120 24872 bytes
SHA-256: 6427f81707bfddab7b1b052430fcf13338652311e27a4879c163e65cd2d29de9
font_01_sfnt_off00008ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC9 18852 bytes
SHA-256: fff481c2afde743a66b8e40316187278209eeeb32aad7e176ca5446ca8f19dfe

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