Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f578313a165874e…

MALICIOUS

PDF

40.1 KB Created: 2021-04-28 20:25:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1e53b497336147adac538c0791516094 SHA-1: 544acfe403d2b7d30d87140817acaa9194abebeb SHA-256: 9f578313a165874e937a13921acb13aca9c9c8da9df19527767052af308b7f3a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for Roblox. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a lure to a malicious website, likely for phishing or malware distribution.

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/roblox-survivalist-hack-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-promocode-give-you-free.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-websites-for-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-cool-clothing-on-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-map-uncopylocked.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-sciprt-executors-free-2021.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/online-generator-roblox-hack.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-do-you-change-your-name-on-roblox-for-free.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-rthro-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-high-school-2-cheat.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/get-free-robux-no-inspect.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_off000040fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40FE 24748 bytes
SHA-256: 4b8872e2d9eb36f84a71ae0a57e7d96d73d309f1eb113e8ae48a138a89bac1c3
font_01_sfnt_off000079c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C8 18660 bytes
SHA-256: ac54ba6a450c9bebf46aeddf1cc2a1399f058bc8d04f0202345fd88e1b10314d