Malicious PDF — malware analysis report

Static analysis result for SHA-256 c603534a705568d3…

MALICIOUS

PDF

41.0 KB Created: 2021-04-30 03:37:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0e56a24cfe39723beff07c1dac5bb160 SHA-1: 92070b69e3bae1a84b1a7a93771704811a41deb6 SHA-256: c603534a705568d3f1ac867cac228a1b118d9c3ff002522f6e6dfac4fef1f12b
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and lures for browser extensions or password-protected archives. The document body explicitly contains a call-to-action button and a URL pointing to a "game hack" generator, which is a common social-engineering tactic to trick users into downloading malware or providing credentials. The presence of numerous links to related "hack" or "free robux" PDF files suggests a campaign distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-asault-rifle-t-shirt-roblox-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-jailbreak-money-hack-script.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/get-everything-free-roblox-console-pastebin.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/good-info-free-robux.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-codes-that-never-expire.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-on-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-fly-on-roblox-hack.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-do-you-get-free-robux-without-downloading-anything.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/the-conquerors-roblox-pre-hacked.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/robux-hacks-2021-pc.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/name-change-client-roblox-free.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_off00004276.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4276 26168 bytes
SHA-256: 29b5f680a37b8b9d801765386662030eac4fc558701e8db50e1f4ad1088eaf18
font_01_sfnt_off00007d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6F 18708 bytes
SHA-256: 16826afabcb100c3fb21f3659c2eb2abe2a4decd1d763daf6933bd8170ff5ac9

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