Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dd253bf381b6bf…

MALICIOUS

PDF

49.0 KB Created: 2021-06-03 12:27:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8dd4a0cf2f5b34ce160dcfb740ea1356 SHA-1: cbeb223f42226fb069088074294a0c954cde117d SHA-256: 68dd253bf381b6bfb23373123864bcf8555bdbabd2d4c28632ab02134e225a55
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users to external sites, including a known malicious redirector at `https://netcdn.online/app/406889139/hack-coin-master-32-mod-apk-game-hack`. It also hosts a large number of SEO-optimized PDF links, likely for link farming or to distribute further malicious content. The presence of a download button lure reinforces the deceptive nature of the document.

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/hack-coin-master-32-mod-apk-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-home_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-games_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_off00004fd6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD6 25096 bytes
SHA-256: 18dcf1535f68e4a9a81b7487fa15c6f96a86d2caee672b4288db222277b6ffb3
font_01_sfnt_off00008802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8802 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_02_sfnt_off00009c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C8D 18364 bytes
SHA-256: 6b28fc028ea92d30d2ccfc591b7a83486534d2c5ffaaf0e6012aed1ad66ec3f9

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