Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d266bb0877d140…

MALICIOUS

PDF

49.2 KB Created: 2021-06-08 16:51:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6b8d5f291569b67fc6e95e88b4ca7a3d SHA-1: 4ec5718b82740cfb527c184ab1da526bb7878c35 SHA-256: 99d266bb0877d14019f61eb3ce6763eaa549859d8ed243116e381233b3e01b41
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and free item generators. The document body, though heavily obfuscated, contains references to these lures. The primary malicious activity observed is the redirection to potentially harmful websites, likely serving as a lure for further exploitation or malware delivery.

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.tw/app/431946152/pet-simulator-roblox-cheats-game-hack In PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/tiktok-app-install-free-jio-phone_GM835599320.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-download-wurst_GM479516143.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E60 26352 bytes
SHA-256: b991ce5e640156d84e8349bee114d9c206572f4dd3ebaa9d038aad022f8692cf
font_01_sfnt_off00008a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A9B 7172 bytes
SHA-256: fab408227234ab28a8030d2bb2974f9bb2c5fe2de10cbd25026b3a7df09a3f2e
font_02_sfnt_off00009bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF3 18956 bytes
SHA-256: 4286ed053f2ef31b990e596cf6fc456cedfbb6cf9f3318edbff994272816bcac

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