Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2003eb990a15e52…

MALICIOUS

PDF

46.7 KB Created: 2021-06-08 21:31:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 56012736fd9f49edb92a8df20d2f710e SHA-1: c79116b0dc9b49fdc448317603864624a2baaa23 SHA-256: d2003eb990a15e52ad905172152b7d0e20bc26a725c75adaf230ad6797e6ad36
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link that redirects to known malicious infrastructure, specifically promoting a 'game hack' for Roblox. This lure, combined with the ML classifier's high confidence, indicates a phishing or social engineering attempt to redirect users to potentially harmful content. The embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/hack-para-atravesar-paredes-en-roblox-2021-en-cualquie-juego-game-hack In PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/minecraft-pe-free-download_GM479516143.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/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/funbloxxyz-free-robux_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_off0000535e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x535E 26248 bytes
SHA-256: 779955bc15f21e41466d43f3ef8af0b33d38a2ca56f672b4c2b67884a9b51a2a
font_01_sfnt_off00008ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC2 20016 bytes
SHA-256: 0d992e2e1e7483d4fefc374c6f945f997c039789b61117efdcac525959296a4d

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