Malicious PDF — malware analysis report

Static analysis result for SHA-256 5934379d5e94d50f…

MALICIOUS

PDF

42.3 KB Created: 2021-04-28 18:17:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dff4c01fe0ccbf96a945e0f5173dc578 SHA-1: 51caaa20a21f8d74432fa24a9cc091e2496b4e5e SHA-256: 5934379d5e94d50f5c437e1822a3bdde93bf883157c6663d200a0864cb0126e0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors and other PDF files, all promoting free in-game currency and hacks for Roblox. The primary lure is a 'free generator' for Roblox Jailbreak, which directs users to a known malicious URL. The document body also contains embedded URLs that lead to further potentially malicious PDF files.

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/new-roblox-jailbreak-hack-free-money-game-hack In PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-generator-no-scams-no-verification.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-hack-kavra-rolplay.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-robux-2021-working.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-get-free-pants-and-shirts-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-codes-for-free.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/top-10-best-free-roblox-items.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/ultimate-trolling-gui-roblox-hack.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/armored-patrol-roblox-hacks.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-no-robot-verification.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/phantom-roblox-hack.pdfIn PDF document text
    • https://freerobux.cyouIn 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_off00004373.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4373 27500 bytes
SHA-256: f8aaa58b12e315b66724ef0ad163517a8f75e603233f1ba78b644781a5759968
font_01_sfnt_off00008106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8106 19172 bytes
SHA-256: cb4e7bfa63feea1ad60e72b180dbc9fb6ac6b8c02ccfc8458a1fa26155b90601