Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c9a171066606c9…

MALICIOUS

PDF

34.5 KB Created: 2021-06-30 23:00:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f48d54a5d7503050929d0bb613222252 SHA-1: 5e467b939ebdae9414f4d3a840c8167ad816b6d8 SHA-256: 87c9a171066606c9dce6bdd4a77d7f45720f8f721ba1ccec24b90fd49f763c55
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this, indicating a social engineering attempt to trick users into visiting a malicious site. While no scripts were explicitly extracted, the nature of the lure suggests a potential for further malicious activity upon redirection.

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.co/app/431946152/free-admin-tool-roblox-game-hack In PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-font-free_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/can-pokemon-go-free-promo-codes_GM1094591345.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-console-code_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hacker-outfit-on-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/cheats-on-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/wurst-commands_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-jailbreak-hack-money-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hacking-classes-for-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-roblox-items-with-working-promo-codes_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-club_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
font_00_sfnt_off00002fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDE 22416 bytes
SHA-256: c6217d0741ca5c999ff313b75cdbc7a5a45a8187ecc91e0c95196c92d24905a6
font_01_sfnt_off00006186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6186 19204 bytes
SHA-256: 3dc2c3a1a40ac2b5eab784243eef8b7b6618deaa5c0d28bd503ecb90ed4005e4

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