Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fdd13cb889d839…

MALICIOUS

PDF

41.5 KB Created: 2021-05-01 20:36:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0fac343fb4a834bfd48d65548b336aaa SHA-1: ff506d272a838d9417ad32e13e3fa3d0fbcc348d SHA-256: f3fdd13cb889d839316f4e57081b116b6d5513a805f3fba0bc79787fdad31f03
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appears to be a free generator or game hack. These links redirect to malicious infrastructure, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

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/how-to-get-free-robux-roblox-2021-game-hack In PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/hack-roblox-perfil.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-printable-roblox-valentines.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/money-hack-ultimate-driving-roblox-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-royal-high-free-diamonds.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-cheat-on-ramboredkill-in-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-giftcard-generator.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/simple-free-robux.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/400-robux-for-free.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-boxing-sim-hacks.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-youtube-hack.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_off000042a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42A2 26300 bytes
SHA-256: 09dc6063f6254ae8065b2a2eeba19ed730e9ddcd1d0626111bb7d8c52cca14ae
font_01_sfnt_off00007ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBB 18756 bytes
SHA-256: 4a56b9f3db40ab98b4d97cdc1632f510c257584268686a38c33d4ddb51d6b46d