Malicious PDF — malware analysis report

Static analysis result for SHA-256 71876f79153c8237…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 20:20:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1f42f86b9efc3ab9414c35db24824556 SHA-1: 0ac6c068964cf0e0122f1bda8f41a99192c5805e SHA-256: 71876f79153c82379aef6508df2a5792eb95c2a2580cb3d2beaa7589d9ab4590
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game currency or hacks. The primary redirector URL is http://netcdn.tw/app/406889139/how-to-get-free-spins-on-coin-master-2021-game-hack. The document's content and embedded URLs strongly suggest a phishing or scam campaign aimed at tricking users into visiting malicious sites.

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/how-to-get-free-spins-on-coin-master-2021-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-robux-free-sin-pastebin-2021-con-jugar_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/como-hackearle-la-cuenta-a-alguien-en-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-roblox-accesories_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/tower-battles-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-how-to-get-free-clothes-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-do-u-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-without-downloading-apps_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_off000032c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32C8 22796 bytes
SHA-256: 04c2170206043234d7f83eda64c499669198c0399f121a50a51a56a38df88958
font_01_sfnt_off000065b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B0 18740 bytes
SHA-256: 0260418c40462ede441e23edbbaa28f8ef5f7472ee43e2d563702d50e072c039

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