Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93731e78cc1a843…

MALICIOUS

PDF

41.7 KB Created: 2021-05-12 08:30:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8a730ab06a9148e8fabd8bc6bb3f2e52 SHA-1: 9bbc87a2284f52a231edb808c1f05a87f6e0f10c SHA-256: d93731e78cc1a8435564e57d03185e6daa0cf9688ba15bf0a31fd9a5a6e29172
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are associated with 'free generator' or 'game hack' lures. The primary URL, https://netcdn.xyz/app/431946152/free-robux-download-game-hack, is flagged as a malicious redirector. The document body, though partially corrupted, contains text and URLs related to obtaining free in-game currency and items, indicating a phishing or scam attempt. The presence of multiple SEO-optimized PDF links suggests an attempt to broaden the reach of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-robux-download-game-hack In PDF document text
    • http://floreswindows.com/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://floreswindows.com/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://floreswindows.com/images/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://floreswindows.com/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/wurst-minecraft_GM479516143.pdfIn PDF document text
    • http://floreswindows.com/images/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/minecraft-free-apk-java-edition_GM479516143.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_off000047fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47FD 24520 bytes
SHA-256: bd29c29722bf92307e5cd8650dec0e1dd1f0c4bee6bf7236e2b13d02171ea7e6
font_01_sfnt_off00007eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEA 18824 bytes
SHA-256: 8406cb1c38774726d91b6a9fb5333918f35ff34bd7dcb56cd5a50b6af28a82ee

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