Malicious PDF — malware analysis report

Static analysis result for SHA-256 943ceb760eb7f536…

MALICIOUS

PDF

35.5 KB Created: 2021-07-03 19:34:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c2e18798b83b6c8c020d0d60c118f0a4 SHA-1: 045d7e4780409181fa73fae1cbc360be441a26b4 SHA-256: 943ceb760eb7f536e31b2edc83b76b78ade2c8fda49b91f172b2a22209007e4f
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to redirector infrastructure, specifically advertising 'game hacks' and 'free generators' for popular games. The primary redirector URL is http://netcdn.tw/app/406889139/daily-free-spin-coin-master-link-game-hack. The document body and embedded links suggest a social engineering lure to trick users into visiting malicious sites, likely for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded URLs indicate a malicious intent.

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/406889139/daily-free-spin-coin-master-link-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-hack-tool-com_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-rs-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/rbxdemon_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-roblox-jailbreak-games_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-images_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-de-roblox-2021-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-rare-cards-for-coin-master_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_off00003315.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3315 23036 bytes
SHA-256: 9d9226d6e09a4e9b7c92eeff0159e9ae11c1b118ab2bf107c26d6acb35eb988d
font_01_sfnt_off000066b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B5 18768 bytes
SHA-256: d697be63ee21a3cec570d2e62d957a88a7de4f3367accd652b11710ad4160183

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