Malicious PDF — malware analysis report

Static analysis result for SHA-256 45483736f1cf5494…

MALICIOUS

PDF

42.2 KB Created: 2021-05-14 09:36:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 26098f8d20d59f4dfae48b33c12b0826 SHA-1: ed28b51c119202cc6129e3215fd8542fe1a35dd7 SHA-256: 45483736f1cf549456397dd4f7220f0e5598212995e17c3bd8484b5701f391cb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free Robux' and game hacks. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection.

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/431946152/free-robux-generator-game-hack In PDF document text
    • https://europe-upkl.eu/images/coin-master-villages_GM406889139.pdfIn PDF document text
    • https://europe-upkl.eu/images/free-robux-com_GM431946152.pdfIn PDF document text
    • https://europe-upkl.eu/images/free-spins_GM406889139.pdfIn PDF document text
    • https://europe-upkl.eu/images/roblox-redeem_GM431946152.pdfIn PDF document text
    • https://europe-upkl.eu/images/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://europe-upkl.eu/images/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://europe-upkl.eu/images/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • https://europe-upkl.eu/images/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • https://europe-upkl.eu/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://europe-upkl.eu/images/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • https://europe-upkl.eu/images/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://europe-upkl.eu/images/hacks-master-coin_GM406889139.pdfIn PDF document text
    • https://europe-upkl.eu/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://europe-upkl.eu/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://europe-upkl.eu/images/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://europe-upkl.eu/images/minecraft-hack-ios_GM479516143.pdfIn PDF document text
    • https://europe-upkl.eu/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://europe-upkl.eu/images/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://europe-upkl.eu/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://europe-upkl.eu/images/free-robux-generator-2021_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_off00004825.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4825 25200 bytes
SHA-256: 950b64a257a4c81fe4c3c3543e6ed0922bff461aa7c9434b728ba1b5eb25b4b6
font_01_sfnt_off00008277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8277 18344 bytes
SHA-256: 10e3e3d4c68cd560ea953d22ca565409121c707f4baa42eec19ee19970d6ace4

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