Malicious PDF — malware analysis report

Static analysis result for SHA-256 d528c5c3830e1e08…

MALICIOUS

PDF

42.8 KB Created: 2021-05-19 13:50:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 994996b2755a5e06213fda435c2ecd51 SHA-1: 3723b2aadacdd639ce4dbca30e4fccc29c8e6380 SHA-256: d528c5c3830e1e084688efcb46f441be4953388cb7c446b833f8ed0ad0d9608f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as lures for game hacks and free items. The primary link directs to 'netcdn.xyz', which is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attempt, likely to deliver a secondary payload or lead the user to a credential harvesting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/free-face-roblox-game-hack In PDF document text
    • http://pdia.de/images/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://pdia.de/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://pdia.de/images/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://pdia.de/images/roblox-script-hack_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
stream_003_off000045c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45C6 27916 bytes
SHA-256: 0f6ed5fc3be5d904bf7a48167ea2bafceaf80ea03baacf5a9e4c7d202d4f5422
font_01_sfnt_off00008550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8550 18176 bytes
SHA-256: 89cd2a226c48b85e3fd50639e1c54ff12a7aea6a284b12bd929af74d1649954d

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