Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc845fd2f016f3d…

MALICIOUS

PDF

35.7 KB Created: 2021-07-02 04:48:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d1b69610acb7ff1050037858c85aeda5 SHA-1: 0e613d56b8c4db0ed14cfbf1efa8905c0fb6d26b SHA-256: efc845fd2f016f3d3cce56f88374d358db5c3961455cb524cf3f7682567b87c0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external sites, masquerading as generators for game hacks and currency. The primary URL, http://netcdn.co/app/431946152/hack-para-atravesar-paredes-en-roblox-2021-en-cualquie-juego-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a phishing or scam attempt leveraging popular games like Roblox and Coin Master. No scripts were extracted, but the structure suggests a link farm designed for SEO manipulation and user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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 http://netcdn.co/app/431946152/hack-para-atravesar-paredes-en-roblox-2021-en-cualquie-juego-game-hack In PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-get-free-robux-no-clickbait-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/obby-gives-you-free-200k-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-cbro-how-to-get-free-knife_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-get-free-robux-easy-2021-july_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-free-to-take-group_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-cheat-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/daily-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/jeuxvideo-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-shirts-templates-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/minecraft-servers-that-allow-hacks_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
font_00_sfnt_off00003030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3030 22672 bytes
SHA-256: 2d569bbfefb87cda5b0cf05bae52585e4d42ebf4a2a3dc68fe2c8ec5c0e6ede9
font_01_sfnt_off000062ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BA 20200 bytes
SHA-256: b67ded8631dbfaae8767c9f06f1222bccc9e34c79852fbc32fc527ec3c4b907a

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