Malicious PDF — malware analysis report

Static analysis result for SHA-256 553ccd4aed57bc2b…

MALICIOUS

PDF

48.3 KB Created: 2021-06-03 21:19:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 445691234b5539ec6da306c2d1b40829 SHA-1: 13e6642c05482ed9111bfbfbf8616f1c14dcb511 SHA-256: 553ccd4aed57bc2b1c3b8394670e9a838c716874378ab99651dc334bc86a8d73
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to redirector domains, specifically promoting 'free generators' and 'game hacks' for popular mobile games. The primary malicious URL identified is https://netcdn.online/app/406889139/coin-master-free-spins-link-no-verification-2021-game-hack, which is flagged as a known malicious redirector. The document body and heuristics indicate a lure for users seeking cheats or in-game currency, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/406889139/coin-master-free-spins-link-no-verification-2021-game-hack In PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000535f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x535F 24772 bytes
SHA-256: 3766a5a3b1170ab001f6636a25a84b4760b72796fdd670301ba5b9b27f0cf8ae
font_01_sfnt_off00008b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9F 4020 bytes
SHA-256: 7d3617ecf51e14e6cffc9372c4441988c3b6cb3ea010f7512aee6af842ef388d
font_02_sfnt_off00009929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9929 18592 bytes
SHA-256: f74899e085c91cd53f5ca09b8a5278408f496fc0c0b246b6d10c1aa0f6296d24

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