Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c4d69d8747e62d…

MALICIOUS

PDF

48.4 KB Created: 2021-06-04 00:42:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 76516d797d7078843209ef97b930ff6f SHA-1: 23179e47410860413b2e29954ad1da89d3b2c140 SHA-256: c1c4d69d8747e62d773e52cf1cf0c8d13a65a5d46afe0d84ebbfd710aa199f34
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and known malicious infrastructure, specifically targeting users interested in game hacks and free currency. The embedded URLs and the ML classifier strongly indicate malicious intent, likely to lead users to phishing pages or download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-free-robux-com-game-hack In PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/corn-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C1 26988 bytes
SHA-256: 9cec7265c37208d70c0cde185a65b64c69dc93736d37260de7bb71d73a1833e1
font_01_sfnt_off000090d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D4 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off00009a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A85 18348 bytes
SHA-256: ea71f63ad969ac354b647f6e6da4581b14ed625e24a3109b04dcf91fda1e68c2

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