Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b4f416f2d8baa3…

MALICIOUS

PDF

34.1 KB Created: 2021-06-26 19:28:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c1e86efede7659f01922942e28568c2d SHA-1: 6faace30ee6b3d0488dd3575ae17eb3b90743782 SHA-256: 31b4f416f2d8baa3bde3e31c31b82f9d971eecec4dcec41ca7977a9efccba9f7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector, disguised as a generator for free game currency and hacks. The document body and heuristics indicate a lure for popular games like Roblox and Coin Master. The primary malicious action observed is the redirection to potentially harmful content via the identified URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-meep-city-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-generator-download-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/download-dimond-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/descargar-fly-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-items-on-roblox-no-pastebin_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-hack-download-for-pc_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-a-roblox-account-2021-ios_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/filter-peint-existe-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-pink-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/get-me-free-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/speed-cheat-roblox_GM431946152.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
font_00_sfnt_off00002dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DEC 22060 bytes
SHA-256: f13f0d560dc37cd589fd1ae576950150a5860263bec39fba7c0d41e9da4619a5
font_01_sfnt_off00005eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB4 19492 bytes
SHA-256: 010141983c3950bd01c25ff75c2242ea37bf5e2512c0468465905c67347115d5