Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f797b69fbd2f8f2…

MALICIOUS

PDF

34.2 KB Created: 2021-07-06 07:41:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 17e33db7ea5d2eaa67aa5b091f040bf6 SHA-1: 79dfbce833c529eb0e7a7e1f5a16f7d43879b1e8 SHA-256: 9f797b69fbd2f8f276c9befbbbb1a800b5c5e78a99f3c4247860dcd1a2e2b13a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising 'free generators' or 'hacks' for games like Roblox. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a lure-based attack pattern. The document's primary function appears to be directing users to potentially harmful external sites, likely for further exploitation or malware delivery.

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.tw/app/431946152/roblox-www-com-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-change-robux-pastebin-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/phantoms-forces-roblox-hack-weapon_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/script-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-gift-cards-2021-25-8_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-1-million-free-robux-breast-milk_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-denis_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-game-just-by-typing_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-hack-999999-robux-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-photosmasher-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-make-your-own-shirt-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-2021-working_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-cracked-client_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
font_00_sfnt_off0000306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x306F 21768 bytes
SHA-256: baf8630e8b7af06da46cb2059c24cbdf64c711ff5ccfcaa4042e5771dc03f1be
font_01_sfnt_off0000604a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x604A 19108 bytes
SHA-256: ceed28034d8c161028cd36873b2602c2ebba079ae57d119b604a35ba28887711

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