Malicious PDF — malware analysis report

Static analysis result for SHA-256 525b37eab2461786…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 20:52:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bce56b6f19d6f251d57ce7df6878c5c3 SHA-1: 194151f4f5151cb5108c045c62dc574104e21aaf SHA-256: 525b37eab2461786d031ec6f35dc375fae46e599f9295fb24f5989fafb588eaa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free spins. The primary malicious URL identified is https://netcdn.online/app/406889139/coin-master-free-daily-spins-and-coins-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector workflow, likely intended to deliver a second-stage payload.

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/406889139/coin-master-free-daily-spins-and-coins-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-cheat-deutsch_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-download-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-downloading-apps_GM431946152.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_004_off000052aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52AA 25024 bytes
SHA-256: 6cf6262285e7a13051de767e889263764ed07daf2a8e804370c629b40982d7fa
font_01_sfnt_off00008c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C59 18480 bytes
SHA-256: 88c5a76ee56cb7e28b06cf9e90949f5a0fd4a72b6dddac6cb3c8c84aebf5620b

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