Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ca668237db8284…

MALICIOUS

PDF

42.9 KB Created: 2021-05-12 10:07:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bbc0c17d473d180edaa6806ffbcd9386 SHA-1: a69e7c3137d3067b11d55bdf2d3f67c6d86d2fca SHA-256: 54ca668237db82844bfdf70ccf9e10bec23e3a286a704bbf8687eaf52bbad588
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically promoting 'free generator' or 'game hack' lures. The document body, though partially corrupted, contains text related to 'free Robux' and 'game hack', reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/how-to-get-free-robux-website-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robux-game_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/haktuts-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-spins-coin-master_GM406889139.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/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/mcpe-client_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/www-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_003_off0000484a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x484A 25688 bytes
SHA-256: 1ff0992de079c1a985eeb23cdf52448de152f84830d60e8580bb0aeb28d7cb65
font_01_sfnt_off00008457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8457 18600 bytes
SHA-256: ac0d4502235c23175446595a7cf8e817a77a023a22f0524dfc344b6b051bbd29

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