Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d99cf53faddfb8…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 09:17:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 21eff396359ab1795fcfdd6b9efe892e SHA-1: 5ef9df646dddf82ce612591268658103b91081ad SHA-256: e4d99cf53faddfb8b05aef2881f7b68946acf39d03e4ff0aa2ca5743e663246a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, masquerading as game hacks or free items. The primary lure directs users to 'netcdn.online' which is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/479516143/minecraft-bedrock-download-pc-free-game-hack In PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/corn-master_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/spin-coin_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/kuso-icu-roblox-hack_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_off00004ff3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF3 25116 bytes
SHA-256: 4890294d6983ee98324d706f3918b7b3f587ffa69c2fe5d20ab0c2cc3fcd78e2
font_01_sfnt_off000088c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C6 18828 bytes
SHA-256: a264e86136786ea36ffe75565c0a75df0f10437a5612c71f93040c03370f29a0

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