Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c881fa8b535d3d…

MALICIOUS

PDF

35.3 KB Created: 2021-07-09 00:24:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e0736b2e87c21401c99b826f96859068 SHA-1: 046f69f36e633233366ee3efaa59b03e517f9608 SHA-256: 24c881fa8b535d3db750a55697ea732c76c72b02840636829828d282a4155928
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this by advertising free game hacks and linking to the suspicious domain. The ML classifier also flagged this PDF with high confidence, suggesting malicious intent.

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/479516143/free-minecraft-server-hosting-with-plugins-game-hack In PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/dragon-ball-rage-roblox-hack-tools_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-win-robux_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-noclip-hack-2021_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/all-coin-master-spin-link-and-free-download_GM406889139.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_off000035cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35CC 22112 bytes
SHA-256: d22723328e41606db1988630ddb3ab4aedec11307112706eb718b1be055e097d
font_01_sfnt_off000065fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65FA 18844 bytes
SHA-256: acfaf3ec89f3d6287f10dcf224a7b6ca2fa14913dee94becfc4eecdab87a7a6c

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