Malicious PDF — malware analysis report

Static analysis result for SHA-256 b499fe89fd1ea9d1…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 21:44:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1f4352682c07d4eb862392abb2413303 SHA-1: f02b8e84a49b194d668ea18a9487ac457511b2bf SHA-256: b499fe89fd1ea9d13e933337aa9f15e8e0390716e44b497ea0910c92bafabfcc
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, specifically the URL https://netcdn.online/app/431946152/free-robux-apps-that-work-game-hack. The document's content and embedded links strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-apps-that-work-game-hack In PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/roblox-lumber-tycoon-2-money-cheat_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/minecraft-free-exe_GM479516143.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_004_off00004fd1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD1 27456 bytes
SHA-256: c76c005b73b89d974cf873cdb45a97d1d4f068482282a9b6b218c4dc0a1daffc
font_01_sfnt_off00008ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA0 19056 bytes
SHA-256: 867cc7ed7a05e00a705c8433c5324c57a550f7e7678a2e8c50298e1974253cec

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