Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8e1a94523720ea…

MALICIOUS

PDF

50.4 KB Created: 2021-06-04 01:07:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 14daeeb6645b5f04cfb407d96417a6be SHA-1: 4aa2c6e67cb6f35ae14a90ba2ab822100894b53c SHA-256: 4b8e1a94523720ead4488acb33ce232af1f866be852cafc370cae2c0dfd0aa64
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting "free game hacks" and "free robux". The primary redirector URL is https://netcdn.online/app/431946152/how-to-change-roblox-name-for-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering lure designed to lead users to potentially harmful content or further malware downloads.

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/431946152/how-to-change-roblox-name-for-free-game-hack In PDF document text
    • http://pustaka.fk.unand.ac.id/repository/robux-free-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/prison-life-roblox-hacks_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_off000053ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53EC 28400 bytes
SHA-256: e9b734a0fe005e66ee37c01a832df39f4f354fe019459069699be67ec7e54ea9
font_01_sfnt_off00009375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9375 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000a01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA01D 19056 bytes
SHA-256: 615cebba423b1c03ae8308d5afe847d6fc39558f9726a846a054a1198e945902

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