Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a191548f4c037e5…

MALICIOUS

PDF

35.1 KB Created: 2021-07-06 13:32:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f2e0649c6629205507ce9af4c50907ca SHA-1: 6cdaeaa5e3be098351eef27da58c52c766a76cf8 SHA-256: 5a191548f4c037e5ea225ddcf77e1fb5cfa3211d7b198e982a6975620d38ce49
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The primary lure, http://netcdn.tw/app/431946152/girl-roblox-avatar-game-hack, is flagged as malicious. The document body also contains similar lures and a call-to-action phrase, reinforcing the phishing attempt. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/girl-roblox-avatar-game-hack In PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-robux-today-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/hack-client_GM479516143.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-homepage_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-tiktok-followers-2021_GM835599320.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coins-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-appsfor-coin-master-daily-rewards_GM406889139.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_002_off0000336f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x336F 22240 bytes
SHA-256: 8ebd02e1cb35b2d4715e3279da577d71adbd052e2a9cdfd755140634e16a8ae0
font_01_sfnt_off000064db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64DB 18824 bytes
SHA-256: 5de93663545e585bb3ec51caaed0e7665131e60661237b1a7a5d41b420e717e4

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