Malicious PDF — malware analysis report

Static analysis result for SHA-256 e141fc65dca5cdfb…

MALICIOUS

PDF

48.9 KB Created: 2021-06-04 06:16:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3811ef87f859eb03bfe86c55aa889169 SHA-1: 494c552203038c8dc985334fe18053c58099a657 SHA-256: e141fc65dca5cdfb0949e21a2ca46755df1e12cb0942a5a8bbfaf51f3a574926
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and free currency lures. The primary link, https://netcdn.online/app/431946152/cheat-for-roblox-super-speed-and-jump-hack-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a social engineering tactic to drive users to potentially harmful content.

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.online/app/431946152/cheat-for-roblox-super-speed-and-jump-hack-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-someones-account-on-roblox_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_off000053db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53DB 26528 bytes
SHA-256: 7b341ef18eb9e15d306430e1e1a566844aefa2110e1061b400d7ef6be821bdf8
font_01_sfnt_off00008f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F12 2828 bytes
SHA-256: a4e15770ab3b920ccbab17816ac2be280610f3f789d7654b00721cdcc5d65b79
font_02_sfnt_off000098c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98C7 19532 bytes
SHA-256: 57095ebebe15bbc988c36acbe1c5d66234d9e981630df70a653ee030171a7581

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