Malicious PDF — malware analysis report

Static analysis result for SHA-256 4837eeeefeef61be…

MALICIOUS

PDF

45.5 KB Created: 2021-06-03 14:33:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 977f3484c1c5f8e8fa11faae00e33b9d SHA-1: 7be50cf00e5c00f5c8d26379dadd82cf335adae2 SHA-256: 4837eeeefeef61be73fc55f757bedb42bdfbd000da33617f144fff6027cd1e45
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links to known malicious redirectors, specifically promoting 'robux hack generators' and similar lures. The document body and embedded URLs suggest a social engineering tactic to trick users into downloading further malicious content. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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/robux-hack-generator-game-hack In PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/robux-offer-wall_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-spin-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-star-codes-roblox_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_off00005059.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5059 27524 bytes
SHA-256: ebe1c30f860ce494076b25549771286ef9b5670c2ef7a98b58095426c9e74f84
font_01_sfnt_off00008d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D47 18836 bytes
SHA-256: 6c5d9737cba936314f1fdec0669ef51c6c91e3ddbd0274bf5dcf0fb00268726f

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