Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cacfb7c823fdf84…

MALICIOUS

PDF

34.1 KB Created: 2021-06-19 09:17:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 643f4c8de099fbe0c2e6e96477873065 SHA-1: 6e2a0aab4659ec2e7322f9c94d1122e71c74669f SHA-256: 7cacfb7c823fdf84a4bcfa97953a1f6bf6b5f13f398cb26915e4f922392387d5
160 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, one of which, http://netcdn.co/app/431946152/free-robux-2021-no-verification-game-hack, is flagged as a malicious redirector. The document body and heuristics indicate a lure for free game currency or hacks, suggesting the intent is to redirect users to potentially malicious sites for further exploitation or credential harvesting. The ML classifier also strongly indicates maliciousness.

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-robux-2021-no-verification-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-time-hack_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_off00002e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E93 21844 bytes
SHA-256: 1c74c0d5603174d75c89c07beb5c4ea3baf0df3c12eae0f665e50396c986e6ea
font_01_sfnt_off00005ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF8 19476 bytes
SHA-256: 55ad41a6ce49086aa15382541082a2b64ef707ba2ed30a01096caf72f6ded3f0

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