Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d16cd507d5fa24…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 15:53:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d0fd29b3834d8f1588d73eec18cb783c SHA-1: 1b0aa71ef2c700fe0aa7de12e16e358428606a91 SHA-256: b5d16cd507d5fa246fc9e8e0fa8e514b940d20bca3a3df2b7b0183a451dbd0ec
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that are identified as malicious redirectors, specifically leading to a 'free generator / game hack' lure. The document body reinforces this by displaying similar scam-related titles and URLs. The primary IOC is the malicious redirector URL identified by multiple heuristics.

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/431946152/savagefrey-how-to-get-free-robux-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/anything-free-on-the-catalog-on-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-4-mobile-24com-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-giftcard-wix_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-jailbreak-hacks-dll_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/blox-supply-free-robux_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
font_00_sfnt_off00003061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3061 21548 bytes
SHA-256: 08184cb859e1a592399fb3ae742e024fdbc04f0875941b2a3f18d85a81b24d8a
font_01_sfnt_off00005f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F97 19280 bytes
SHA-256: a52f20d95b6c04aa84d19cbcfd286d520f76397a36b6bf72a58a3a1e5ea0d8c6

Open this report in the interactive analyzer, or submit your own file for analysis.