Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3f2419d799d6db…

MALICIOUS

PDF

44.8 KB Created: 2021-06-04 02:35:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 61f32ea286f67f358228e16fe6d9b747 SHA-1: 49ac4960bba237757ff01374f29a361595cc272f SHA-256: 3d3f2419d799d6db99e0e279b496522543c8f630128e71773fe11752d1c68754
160 Risk Score

Malware Insights

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

The PDF contains links to a known malicious redirector infrastructure, specifically advertising free game hacks and currency. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to game-related lures and embedded URLs, suggesting an attempt to trick users into visiting malicious sites. The primary IOC is the redirector URL which likely serves as a gateway to further malicious content.

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/479516143/minecraft-realms-free-codes-game-hack In PDF document text
    • http://perpus.wdh.ac.id/repository/block-best-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-get-coins-on-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/pubg-uc-discount_GM1330123889.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/pubg-uc-kaise-khariden_GM1330123889.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-spins-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_off00005313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5313 25392 bytes
SHA-256: c406ced32f78afb3ba26c47b828e510f92bb0bed48f8330c23d1bebadca9aedb
font_01_sfnt_off00008d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1F 18216 bytes
SHA-256: 30a8f83054e231b1bb485b1ca025b33fda8ee43bcea67b958af1de796f39c45f

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