Malicious PDF — malware analysis report

Static analysis result for SHA-256 433779c6d1d7ab60…

MALICIOUS

PDF

44.3 KB Created: 2021-05-12 19:03:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b491cb3126328f84c5e445a0a6af47d8 SHA-1: 988b04fe32587c0797eabfc5367544018954bd45 SHA-256: 433779c6d1d7ab60625496395b95b095a355899d460fd43a6a8ae220c0ae96cb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to known malicious infrastructure, specifically promoting "game hacks" and "free spins". The primary lure URL is https://netcdn.xyz/app/406889139/coin-master-free-spins-daily-link-updated-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector pattern, likely intended to lead users to phishing or malware download sites. The document body, though partially corrupted, contains the main lure URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/406889139/coin-master-free-spins-daily-link-updated-game-hack In PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-hack-ios-12_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/simplysarc_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/androeed-ru-minecraft_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-robux-for-free-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_off00004c57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C57 26420 bytes
SHA-256: 579e320a8d603b4e096e9703687821da62ce2b3d49cd971ddf326df346af98b0
font_01_sfnt_off00008938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8938 18836 bytes
SHA-256: 483be81730c5d51d00079e0b96a35004c6f4ace92d0df16fea0b4a10a7a49318

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