Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3151c00708f12e3…

MALICIOUS

PDF

42.5 KB Created: 2021-04-24 12:39:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 856e48d54fa81266be5966920a7e8193 SHA-1: 93cad473e4429568b6cf086a60398c16d3f49c8d SHA-256: c3151c00708f12e396545ebacd0327f6d70f9db07c8e70d956273c2efe0861e7
200 Risk Score

Malware Insights

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

The PDF document contains multiple lures related to game hacks and free Robux, directing users to a known malicious redirector. The document also contains a call-to-action button and a lure to install a browser extension, both common social engineering tactics. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.xyz/app/431946152/free-robux-without-any-verification-or-downloads-or-offers-game-hack In PDF document text
    • http://e-library.akademitelkom.ac.id/repository/devil-roblox-tshirt-free.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/reversal-hack-roblox.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-shirt-shading-template-free-shipping.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-admin-thumbnail-roblox.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-do-u-hack-roblox.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-roblox-on-ps4-for-free.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/best-roblox-hack-executer-free.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/talk-as-someone-roblox-script-hack.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-robux-2021-on-iphone.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-how-to-get-free-obc-2021.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_003_off00004347.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4347 26184 bytes
SHA-256: 9dfe46c64f1043e577d74dbdea81a4f644ae200156025dbdb29ef3a08eb9db28
font_01_sfnt_off0000803a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803A 19724 bytes
SHA-256: 04fae91444e3b43a7334850479af54bfeb71d813e0f3f18462fe14187ab8ed67

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