Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7fb465c7c27c81…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 21:09:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c6014be625c99856d03e9bc6ef4f8fe9 SHA-1: 70d499f21ff427f544408f1426138249a3c92bd6 SHA-256: 6b7fb465c7c27c81caeef5641ce61c629bd30451fb80ba235230f4f47a012ccb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The primary malicious URL identified is http://netcdn.tw/app/835599320/is-tiktok-free-on-app-store-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit user interest in gaming and free services to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 3

  • 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.
  • 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/835599320/is-tiktok-free-on-app-store-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/hack-download_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/can-you-get-hacked-on-roblox-with-2-step-verification_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/fallout-plasma-rifle-free-roblox-model_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-how-to-make-a-anti-cheat-system_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-hack-boku-no_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-roblox-cards-by-doing_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-real-hack-2021-quick_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-hide-and-seek-game-for-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-insta-arrest-hack-jailbreak-pastebin_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32BD 21692 bytes
SHA-256: fc634469dcc0020f5a0f3c2380da9378dbd658cae83f38ca9b0b88e9d1a6491c
font_01_sfnt_off0000625c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625C 3124 bytes
SHA-256: d6dd29adb69da7f9a23a5e3791282a61e2f811794f560a0c409c8747766d9102
font_02_sfnt_off00006d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D15 18148 bytes
SHA-256: 091d39c8b8c9c90d0205e8d7d61956532e0a5ab6739657948102fed785340967

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