Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa46ea29dc7aacef…

MALICIOUS

PDF

33.2 KB Created: 2021-07-07 12:02:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 795069c3d768f5d0d658422e749ff7af SHA-1: 9d662dc7b2dfff10f3fb608e04d0ce213cc5f2d3 SHA-256: aa46ea29dc7aacef3a3ae83a8df91d29a58c619d5f7cd15f32998e8a29ffd6a4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free game hacks and currency generators. The ML classifier strongly flagged this PDF as malicious. The primary lure appears to be related to 'Robux' and 'Coin Master' cheats, directing users to the URL http://netcdn.tw/app/431946152/bux-gg-robux-free-game-hack, which is identified as a malicious redirector. No scripts were extracted, but the embedded URLs and heuristic firings indicate a social engineering attempt to drive traffic to potentially harmful sites.

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/bux-gg-robux-free-game-hack In PDF document text
    • http://lib.akper17.ac.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-hack-to-get-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
font_00_sfnt_off00002c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C12 22116 bytes
SHA-256: 3556c0f7621d28388370f954e667008a25531209d04114a0182217191eea2c1a
font_01_sfnt_off00005d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D60 18716 bytes
SHA-256: ceb96bcce7201d9a7ae6d76b35bd05639ee9f0a30dad638d5074f4338692034b

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