Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e50a40adc93f1c…

MALICIOUS

PDF

43.7 KB Created: 2021-04-27 05:02:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ff908397e33e43c071c33b033b866ad6 SHA-1: 59b77325dbe44346cd295c2d1872828a33c01f8f SHA-256: f3e50a40adc93f1c582c66a8064b416dd2cb71617872a00f066b8990057cb811
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector hosted on netcdn.xyz, which is flagged as malicious. The document body and heuristics indicate a lure for a "free generator / game hack" for Roblox, likely to trick users into downloading further malware or visiting malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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-skin-strucid-roblox-game-hack In PDF document text
    • https://lib.stie-yai.ac.id/repository/c7-roblox-hack.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/download-roblox-android-free.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/get-free-robux-gg.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-hack-people-for-revenge-on-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-2021-june.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-colouring-drawings-of-roblox-characters.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-clothes-giveaway-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-play-now-for-free-no-sign-up.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-free-robux-live.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-scp-079-free-model.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_off0000402e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x402E 26444 bytes
SHA-256: 99d278a88b0f4b59c84bca46be76ea4a011790100fe8f852ace9e022c0cae4c2
font_01_sfnt_off00007b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B23 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000087cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87CB 18656 bytes
SHA-256: 61061dba8dc12420a5d28010bdf7bd4812411bff00625e0b8ecb50155043db7a