Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a75f4e84e3a2bd8…

MALICIOUS

PDF

33.1 KB Created: 2021-07-05 16:59:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4a4983f8661a16eb63eb5f29847f2fda SHA-1: 081a1fdd7b3e3e364f6d761117ba5caed351e141 SHA-256: 3a75f4e84e3a2bd8afff806eda3329bf09a1853359ba65c6e5603445788cd819
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of game hacks and free currency to trick users into clicking malicious links. The primary URL, http://netcdn.tw/app/431946152/how-to-ban-someone-with-hacks-on-roblox-game-hack, is identified as a malicious redirector. The document's content and embedded URLs strongly suggest a phishing or scamming attempt, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/how-to-ban-someone-with-hacks-on-roblox-game-hack In PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/hack-coin-master-online_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/caillou-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-by-agarminer-pastebin_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-generator-no-human-verification-ios_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-apk-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/brady2021-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/april-fools-day-2021-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-hack-no-human-verification_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_off00002b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B00 21832 bytes
SHA-256: f8a5059e52ff0e6043a01323f8954ec31d60b06d8ae2ddc5382612fdcc6737cf
font_01_sfnt_off00005af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF3 19668 bytes
SHA-256: 36f20e6dd733f51a064e4b33b5ab6d4ca10dc9e1021b9b4a59223c2b45fabc82

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