Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c351f7dc153b94…

MALICIOUS

PDF

41.7 KB Created: 2021-05-12 21:03:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7baee3a55fa5daca0e048024ae02a944 SHA-1: 1b8a86378ed609ff46970c6995a3e3f8d2057a57 SHA-256: b2c351f7dc153b94b4e3425a05b1b48b19c0b11f674a6deba7d1eb78bff4c75a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a common lure of free game currency and hacks to trick users into clicking malicious links. The embedded URLs, including the primary redirector at `https://netcdn.xyz/app/406889139/www-coin-master-game-hack`, are associated with malicious redirector infrastructure. The document also contains numerous links to other PDF files hosted on `pustaka-smpn3tpi.com`, likely serving as further stages of the attack or additional lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/www-coin-master-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-download-hack-ios_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
stream_003_off0000482c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x482C 25260 bytes
SHA-256: e8879385fb8a2d019ac9714c26d58b0cc830d0679e678ed57a35bcfc55649e65
font_01_sfnt_off00008191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8191 17908 bytes
SHA-256: 6f31903e710e2f0fcec5102e216c8b2505ef46bc9ceeb62cc07342564c5c8e6e

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