Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3e0a4164422709…

MALICIOUS

PDF

44.7 KB Created: 2021-04-25 21:47:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 031d7a01749a37103d6b264cfd3afae1 SHA-1: e481e6e462d61cedb143156566fa9b732d7681cc SHA-256: bd3e0a41644227096349039f64e4c6b03ce3314fa0cd6f360fa7d0149a1ae025
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure, disguised as a lure for 'free Robux' or game hacks. The ML classifier also flagged this PDF as malicious. The embedded links likely lead to further malicious content or phishing pages, attempting to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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-apps-that-dont-use-adgates-game-hack In 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-become-hacker-in-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-without-verification-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-cheat-in-minerh-eaven-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/hacks-para-counter-blox-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/hack-coins-pizzeria-roleplay-remastered-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/robloxgiveaways-top-roblox-hack.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-cheat-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/speed-run-roblox-hack.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/playesp-hack-roblox.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000420b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x420B 26276 bytes
SHA-256: 0098fb69e529a0cbe4cc5df55cb27e92c46265ae2f46f91369b9e274a122240b
font_01_sfnt_off00007df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF4 3312 bytes
SHA-256: 40bd8eebcb3a0d68a8646f1930e84f30a44bfa48525263c6c528f0bc1e9c1677
font_02_sfnt_off00008944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8944 19504 bytes
SHA-256: d6fb10d699733ffa87d355dca47c0abfee35aa0725ac4a62fade365f3e5ec25e