Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d086cacca8d3bf…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 13:30:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 370b83f83a70bf3079776a9b9d2e90a3 SHA-1: 35588c8a41f71edd46cb19bde66ed1d3a6c46393 SHA-256: 25d086cacca8d3bfc974ebc711c460a851a74d09e71f3b95166233006f025db7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and free currency generators. The primary link, https://netcdn.online/app/406889139/coin-master-free-coins-link-game-hack, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to game hacks and download lures, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-free-coins-link-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-cheat-engine-no-download_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/pubg-74-uc_GM1330123889.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/tiktok-free-real-likes_GM835599320.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/abd-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-no-verification_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_004_off00005305.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5305 25476 bytes
SHA-256: 32ac63223458f27662c23685dd78c5337f26c9ec5f4d4ad0899456b442910cb4
font_01_sfnt_off00008cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF7 17880 bytes
SHA-256: 5ce88b684446e36e89a0643934549b22fce1d776877bbe9d9a558feafde7429d

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