Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4064559f940cca…

MALICIOUS

PDF

40.7 KB Created: 2021-04-30 12:09:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 262dc96259a68b9866ad0ff97d84810a SHA-1: 175a88de2efffcd9a8a2093ce8f249bf43b9c34c SHA-256: fb4064559f940cca7e770929ec6f31e740eb254a83c452c5625e51b33e80da82
160 Risk Score

Malware Insights

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

This PDF document employs a common lure of 'free Robux' and game hacks to entice users. It contains multiple links to external websites, including a known malicious redirector at `https://netcdn.xyz/app/431946152/free-robux-hack-no-download-2021-game-hack`, which likely serves as a gateway to further malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.xyz/app/431946152/free-robux-hack-no-download-2021-game-hack In PDF document text
    • https://www.regaloscabalgatas.es/ckfinder/userfiles/files/descargar-qtx-hack-roblox.pdfIn PDF document text
    • https://www.regaloscabalgatas.es/ckfinder/userfiles/files/how-to-get-free-1-million-robux.pdfIn PDF document text
    • https://www.regaloscabalgatas.es/ckfinder/userfiles/files/where-to-put-code-for-free-roblox.pdfIn PDF document text
    • https://www.regaloscabalgatas.es/ckfinder/userfiles/files/roblox-ccv3-speed-hack.pdfIn PDF document text
    • https://www.regaloscabalgatas.es/ckfinder/userfiles/files/roblox-cheat-tables.pdfIn PDF document text
    • https://www.regaloscabalgatas.es/ckfinder/userfiles/files/how-can-i-get-free-robux.pdfIn PDF document text
    • https://www.regaloscabalgatas.es/ckfinder/userfiles/files/roblox-free-account-dump.pdfIn PDF document text
    • https://www.regaloscabalgatas.es/ckfinder/userfiles/files/how-to-hack-accounts-on-roblox-with-cheat-engine.pdfIn PDF document text
    • https://www.regaloscabalgatas.es/ckfinder/userfiles/files/free-stuff-in-roblox-games.pdfIn PDF document text
    • https://www.regaloscabalgatas.es/ckfinder/userfiles/files/how-to-hack-apocalypse-rising-on-roblox.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_off000041a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41A3 24704 bytes
SHA-256: a062f7cde5ec5c95917b1f40a7f39573f6ad7f0e60014705b757a9899118a7f1
font_01_sfnt_off000079ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79AE 19396 bytes
SHA-256: 1457d4e1909eb4746a1af20a27f62614b9f0b617666743104add29b0adc2e58f