Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc531b9fec11fa4e…

MALICIOUS

PDF

45.3 KB Created: 2021-06-04 05:20:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 907ff7d741b602b1242c724f51593e0e SHA-1: 63ff680cf71cc9b8c37c591457dee429a00397c2 SHA-256: cc531b9fec11fa4e2acb6c4f3b24322e4e8cf29bc2c1501747d2ad0d7f3fd8d8
160 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it links to a malicious redirector, specifically a 'free generator / game hack' lure. The embedded URL 'https://netcdn.online/app/431946152/claim-robux-game-hack' is identified as malicious infrastructure. The document body, though heavily obfuscated, contains references to this URL and appears to be part of a social engineering attempt to trick users into clicking the link.

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/claim-robux-game-hack In PDF document text
    • https://digilib.stieama.ac.id/repository/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-free-robux-codes-2021-december_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-games-free-games_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/androeed-ru-minecraft_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/minecraft-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-hacked-com-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_004_off00005018.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5018 26676 bytes
SHA-256: 8ee2b58185aeef57abff938c6726e1f3b4d3c2abd77568ec7a1b79f7910e55e6
font_01_sfnt_off00008def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEF 18532 bytes
SHA-256: 5f88bcb9a20179fc356a8464fa62ff550b3c80ad45ddbf6fdbf78de33d5b2b60

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