Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcb3b0022250bf1…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 22:47:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 22035d0b65b339c8b806e1fdd11865a5 SHA-1: 4af5780b1687e1c3ced50a05fb99bd5ec48f2f5a SHA-256: 7bcb3b0022250bf1534e59fc298d0ad1a5c9c646f3c7b8e292838ae5be4de261
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux' and 'game hacks'. The primary link identified is https://netcdn.online/app/431946152/free-robux-rewards-game-hack, which is associated with known malicious redirector activity. The document's content and heuristics strongly suggest a social engineering lure to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/free-robux-rewards-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/what-is-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://collectrobux.coIn 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_004_off00005235.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5235 24572 bytes
SHA-256: 49aa44792965934db9a6fe90e387bde80dda58283919e8b5f640d955d1680ccf
font_01_sfnt_off00008a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A45 18580 bytes
SHA-256: f6e5d240c50f73aa936fa09c98082d3b637660329d811c3f0d463ac63f7ff7de