Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5b01b211401e4b…

MALICIOUS

PDF

49.5 KB Created: 2021-06-11 04:33:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a4c51711aa6f553c85556840f2319edb SHA-1: 76341b57f29558d88cbb2e6c164d57bdbe363de1 SHA-256: 8a5b01b211401e4b15ccc74b0a4982f91bfdeaaa26947504be7f8161d9c4b9fd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, disguised as game hacks and generators. The primary lure URL is https://netcdn.tw/app/431946152/roblox-free-download-no-sign-up-game-hack, which is associated with a 'free generator / game hack' lure. The document body, though heavily obfuscated, contains references to these lures and embedded URLs, indicating a social engineering attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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/roblox-free-download-no-sign-up-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-free-robux-codes-pastebin_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-swat-shirt-free_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-free-event-items_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-hack-roblox-accounts-2021-unpatched_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-generator-no-human-verification-real_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-robux-generator_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
stream_004_off00005310.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5310 33076 bytes
SHA-256: a49f0f452a6ea662ab0885850af3d073bc400ec564e796018ed320220378e9de
font_01_sfnt_off00009bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDA 19452 bytes
SHA-256: 3ec6e78b5c9a0d01bd2aee5cdc689e5e007c16f2ec459787eea8e6861d036fe7

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