Malicious PDF — malware analysis report

Static analysis result for SHA-256 defb9a757610994d…

MALICIOUS

PDF

41.5 KB Created: 2021-05-18 01:55:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6ffea4ec9a69afa144968d7dcd8cde68 SHA-1: 0b32d7ed399197b36502ec6a5664863d60602484 SHA-256: defb9a757610994d30b8b4bc10e07bc099df86ab6e996de66d1ca6e9c39daa7a
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs, suggesting a link farm designed to redirect users to potentially malicious content. The document body and heuristics indicate a lure for game hacks and cheats, such as Minecraft and Roblox. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/minecraft-free-apk-java-edition-game-hack PDF link annotation
    • http://umksn.pl/images/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-a-lot-of-robux_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_off000049e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E8 23668 bytes
SHA-256: 9d8a9e8eb00454f34b099111b24885f35a23167fef68f983a833156b23a2b3dc
font_01_sfnt_off00007f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F18 18508 bytes
SHA-256: 7f805caa59ccd6978215bee4eedf28eceb946361fac8d119f3ca1e79f02f350d

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