Malicious PDF — malware analysis report

Static analysis result for SHA-256 211d11b5b6538521…

MALICIOUS

PDF

34.7 KB Created: 2021-07-10 02:14:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a5494aa50d16d5024e871a76f0bfd471 SHA-1: 3a720ddd0e946cd8f301a352095d2c376bfcdafc SHA-256: 211d11b5b653852154e4a76179b69d10bac1674beafba53a7a7090cae52b9239
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector. The primary lure appears to be a 'Master Coin Free Spin' generator, directing users to the malicious URL http://netcdn.tw/app/406889139/master-coin-free-spin-game-hack. This suggests a phishing or scam attempt to redirect users to potentially harmful content or further malicious sites. No scripts were extracted, but the document structure and embedded URLs strongly indicate a 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/406889139/master-coin-free-spin-game-hack In PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-jailbreak-cheat-engine-hack_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-daily_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-client-download_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-roblox-render_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-roblox-boombox-codes_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/earn-free-robux-rbx-blaster_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/get-me-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000320c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x320C 22804 bytes
SHA-256: 07712a169c6b7b5368a8bf28e4b89e3d32c67575ed2861744d74609c6b3f7425
font_01_sfnt_off00006543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6543 18176 bytes
SHA-256: e7ebdb51c22119da7989f291c4e1e79e43f48b2212e10ddb7071af0af135db83

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