Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d06fe1b2b0f1bc…

MALICIOUS

PDF

44.9 KB Created: 2021-06-07 12:43:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bdff7ce3f23ffd17860f08c7228db942 SHA-1: f0582c21088109c79e784244ad3963018b6779f6 SHA-256: c4d06fe1b2b0f1bc0a1bf7d8d9a065329f80c35cfe5c794a83562b6f62a6cb73
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and external URLs, masquerading as game hacks and generators. The primary malicious link identified is https://netcdn.tw/app/431946152/roblox-admin-hack-2021-game-hack, which is flagged as a known malicious redirector. The document body, though partially corrupted, contains references to this URL and other similar download links, indicating a lure to download further malicious content.

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-admin-hack-2021-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-ha-sido-hackeado-por-john-doe_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/give-me-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

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_004_off00004eee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EEE 25800 bytes
SHA-256: 1b2b3aebe9d24c7f4908142c916889d9672db724a4e5b7c8ad3417fc740e8559
font_01_sfnt_off00008a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A40 19140 bytes
SHA-256: 0aac04e7071ff021cda5fc7a93595a51fe77097ab99ffe221365c1af3e80f200

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