Malicious PDF — malware analysis report

Static analysis result for SHA-256 5638458fe2286c4c…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 18:04:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f4fca3cea93c1b20a292a5c4c1aef359 SHA-1: 8e5ffd84282ceeb32cc68ef33ea09ae06937893a SHA-256: 5638458fe2286c4c2dcf8f68658c85ed66e6d488862cc6dd11e3f0afabc089d9
160 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a redirector link, specifically targeting users with lures for game hacks and free spins. The document body and embedded URLs reinforce this by advertising 'Coin Master Free Spins Generator' and similar cheats. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which likely leads to further malicious content or exploits.

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 http://netcdn.tw/app/406889139/coin-master-free-spins-generator-no-human-verification-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/is-tiktok-free-to-install_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/is-it-illegal-to-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-cheats-ios_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-site-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/bux-life-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/ninja-assassin-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-hack-on-roblox-saber-wars_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-roblox-servers_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-admin-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/200-free-spins-coin-master_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
stream_002_off0000300c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x300C 22748 bytes
SHA-256: f6713bd2ab9185ba73844badccc833a4efddaea093a9bef5c1738ba4f8492ec7
font_01_sfnt_off000062f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F0 18708 bytes
SHA-256: 1ff6fc6875c0ed87444375644fa6874c804e917e127920e9a1fe182e3e73d010

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