Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15922136d3d3551…

MALICIOUS

PDF

49.7 KB Created: 2021-06-10 23:34:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 22d57ac67e1d51457d222974e97691ed SHA-1: 5797598d65340a999836ec382df7c9aca7d7c107 SHA-256: e15922136d3d3551535a8deb6e840c8c1fcbf4ac9d5bed3dd6d013b9a4134354
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 generators' or 'game hacks'. The primary malicious URL identified is https://netcdn.tw/app/431946152/fortnite-free-robux-generator-game-hack, which is likely used to funnel victims to further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure strongly suggest a phishing or scamming attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/fortnite-free-robux-generator-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/fastbux-me-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-easy-no-wait_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/synapse-x-hack-roblox-downlod_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/mcpe-com_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-without-downloading-apps_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
stream_004_off00005149.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5149 28356 bytes
SHA-256: f0a4bef946f59134860c3ea9af5be8db58a1567ad5bac0aebe116544ff45b50f
font_01_sfnt_off00009208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9208 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F1A 18468 bytes
SHA-256: 1eb223ee11506b562df9828892a418b32f2613b4556460ff7d73c2df13b4cc75

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