Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dd78665ccf6c0a…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 05:42:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c3c592cbd8b4bf1386dd395438de0377 SHA-1: 00e9eb3aaf1e40e8f82c30b647b8b686a4f895db SHA-256: 54dd78665ccf6c0a6a4778ad521a2bd703cee05862a1275fd11c0a77f42115f5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one that redirects to malicious infrastructure, disguised as a 'free generator / game hack'. The document body, though heavily obfuscated, contains references to game-related lures and embedded URLs. The presence of these links and the ML classifier's high confidence score indicate a phishing or scam attempt designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/free-roblox-toy-codes-game-hack In PDF document text
    • http://katalog.gemalibrary.net/repository/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/pubg-30-uc-free_GM1330123889.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-scam_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-daily-fb-champion_GM406889139.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_off0000532d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x532D 25956 bytes
SHA-256: b10ec2723ab5122692fc9294553d48714d76cc7f1519bc3b45cd2f12f5b86bf8
font_01_sfnt_off00008f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F71 18300 bytes
SHA-256: 61c572cb3620b4cd8f14a1e394f9b91f9f748a9789523e43842f9c1d8904fae7

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