Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f4aab5b22f225e…

MALICIOUS

PDF

49.3 KB Created: 2021-06-10 23:35:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b02216f107e84916b3e8936fc0485282 SHA-1: 21df8aba26222a7120152539af822f7ca9b4c68c SHA-256: 75f4aab5b22f225e741e0fc1ef02eebf30dc6f89cd68dff54906fb74097eb1ab
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure, designed to lure users into clicking on 'game hack' or 'free generator' content. The primary malicious URL identified is https://netcdn.tw/app/431946152/cheats-for-getting-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

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/cheats-for-getting-robux-game-hack In PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/cheat-forums-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/robuxhub-net_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/pastebin-roblox-accounts-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-website_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/pubg-uc-to-usd_GM1330123889.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-hacks-4-free_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/bloxpage-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_off0000533f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x533F 27700 bytes
SHA-256: e80708d399f8f1e809879a546db321b0d2c6a172728a4592967f7bd8b5fb9336
font_01_sfnt_off000091f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91F0 3028 bytes
SHA-256: ae9754f2790d53c93b9c3207e01e4070c3b870acab8fcf0b886a71c4117202b1
font_02_sfnt_off00009c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5C 18920 bytes
SHA-256: 9494d4d74bce46bccac0a4296d78b754a66a2304697e53823de72048aa8ac086

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