Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d5c1330137c87b…

MALICIOUS

PDF

47.4 KB Created: 2021-06-04 04:04:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f37332ab345db11f2e79d6ef3a5093e3 SHA-1: 5f849a374b930f5029f8178533623529412dbf6b SHA-256: 23d5c1330137c87b26987d48d06b2bac9dd06e9f0ea2adc4c04dd80309f871c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary malicious URL identified is https://netcdn.online/app/479516143/minecraft-free-download-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector designed to trick users into downloading potentially harmful content. The document body, though partially corrupted, contains references to game hacks and downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/479516143/minecraft-free-download-2021-game-hack In PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/tiktok-for-free-movies_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/moonactive-free-spins-2021_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
font_00_sfnt_off00005480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5480 24400 bytes
SHA-256: 61782ce87d5d53e9cb2e3679c2898cf49b24a56aec5ce952c7d41f25e9654964
font_01_sfnt_off00008b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4C 2912 bytes
SHA-256: fa76cc2dab30b56d5305de71ce949b6adffd6580af2f26905a33966a3200adbb
font_02_sfnt_off00009548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9548 18692 bytes
SHA-256: f0fa5510acf1599a685d464226cd2f0c140795c6d8c228f219ca543c0e165813

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