Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9c890679d51e29…

MALICIOUS

PDF

34.7 KB Created: 2021-07-07 20:29:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bb4f5c41382b693ffe8a00298d028752 SHA-1: 7e38cfc4933f640797ab13653c68356a8275761a SHA-256: 4b9c890679d51e29f069b809f398a5f73590b3abf743730840db5e33f7459b79
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to trick users into clicking malicious links. The primary link, http://netcdn.tw/app/406889139/coin-master-daily-free-spins-link-today-game-hack, is identified as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a workflow designed to lead the user to potentially harmful content, likely for credential harvesting 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/406889139/coin-master-daily-free-spins-link-today-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-bluestacks-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-4all-cool-hack-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-almost-any-game-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/cheat-engine-la-roblox-para-hilesi-nasil-yapilirir_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/fly-hack-roblox-weight-sim_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/well-hack-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-followers_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-sexually_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-human-verification-android-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/cheat-in-roblox-robux-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-all-free-stuff_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-free-stuff-codes_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/shirt-template-roblox-download-free_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_off00002ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ECF 23276 bytes
SHA-256: 91c24cc9eed37b98b5d72dd3d34fd38ef3e128262106a93c93ab156458ee6d2d
font_01_sfnt_off000062f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F7 18940 bytes
SHA-256: 5cc00af5396ac6d0bbe2617822e874747972297797067d6a5c9a01e6a5c32b4c

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