Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28687ef0f267a85…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 09:28:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 77fd70c589d605d425623ebd7bd75ada SHA-1: fc5bfaefeefda1c4992d8b385a4ddb147e210cf1 SHA-256: b28687ef0f267a851233e1172791646a92bb0fc9a4bf43b1341cd5ed1b216210
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to sites offering game hacks and generators, such as 'roblox-hack-2021-game-hack'. These links are indicative of a phishing or scam attempt designed to lure users to potentially malicious websites. The presence of numerous redirector links and the ML classifier's high confidence score support this assessment.

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.online/app/431946152/roblox-hack-2021-game-hack In PDF document text
    • http://elibrary.perludem.org//repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/pubg-50-uc-free_GM1330123889.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/worst-client_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/client-minecraft_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-group-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hack-coin-master-1_GM406889139.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_004_off00004e9e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E9E 25020 bytes
SHA-256: 48e72f9d03ad8f5f0f3dd1219dd63fa36233c05ff96e1b888a29e9a8cbce617f
font_01_sfnt_off00008865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8865 18584 bytes
SHA-256: 2941163c9806e22b58ea5552aa71059231a9f2c3bbffbca0ecd460ca17501cff

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