Malicious PDF — malware analysis report

Static analysis result for SHA-256 402101da96842e0a…

MALICIOUS

PDF

46.4 KB Created: 2021-06-03 12:04:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c76ab27ee031856496e172b603854b4b SHA-1: 4b03617eb353be88656cf16c9265d38b378a3735 SHA-256: 402101da96842e0aadaf0fc611d2a5f102a77610af7e89adb4f3620ddc43af6b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users with promises of free in-game currency, such as Robux. The primary malicious link identified is https://netcdn.online/app/431946152/how-to-get-free-robux-for-real-game-hack, which is flagged as a known malicious redirector. The document body, though partially corrupted, contains similar lures and references to the malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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/how-to-get-free-robux-for-real-game-hack In PDF document text
    • http://lc.pustaka.unand.ac.id/repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/tiktok-free-like-2021_GM835599320.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/actual-free-robux_GM431946152.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_off00004c11.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C11 25916 bytes
SHA-256: e644c67ad5a1fafa4d73d5c35bc836f2c3caaedc08e786f5862f53a6480b71cb
font_01_sfnt_off000087d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D8 2824 bytes
SHA-256: 1d0cb1023eaa225682b8e7a2c8df4e4c96545ba7eedaf3d9844e51183e9ca189
font_02_sfnt_off00009184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9184 18584 bytes
SHA-256: 4c8fb6f4ba3d8fd1a53aecf8e038afdea7cc6760123f6d2281f23f521b1068d8

Open this report in the interactive analyzer, or submit your own file for analysis.