Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde31945c4e8d0ae…

MALICIOUS

PDF

42.0 KB Created: 2021-05-10 22:45:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 477e20d05dd13c007efd560dab0e813a SHA-1: 769fad694014a7b96c796883c16ae3cdfcd6b3b1 SHA-256: dde31945c4e8d0aef8a344004f1ad3c6e27aa62dacccfd749b4039cff47cc8c5
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirectors and known malicious infrastructure, disguised as a lure for game hacks and free spins. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to direct the user to a compromised site. No scripts were extracted, but the overall pattern points to a phishing or redirection attack.

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/406889139/40-free-spins-coin-master-game-hack In PDF document text
    • http://zercalo.org/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/no-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-coins-and-spins-on-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_off00004683.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4683 25932 bytes
SHA-256: 9c48186d9de1f20e9e734dd3072a1ebbcdf50753f05bf196ca699e813c6f74e4
font_01_sfnt_off0000822a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822A 18120 bytes
SHA-256: adc3b494d1fa0974f6acdf3c8a88f4cec1eca3c3c07b4c24b7a089c53791e33f

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