Malicious PDF — malware analysis report

Static analysis result for SHA-256 20645a72b1571dc6…

MALICIOUS

PDF

47.2 KB Created: 2021-06-09 08:26:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f8cc0b79576701449b1119312fc32fa3 SHA-1: 14b0d02198f44e709f79fb32425b468f18d8903f SHA-256: 20645a72b1571dc6b7859bb7784d8c449143ad9971355e874565b2fc1bda2120
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free game items, directing users to a malicious redirector URL. The document body and embedded URLs suggest a phishing or scam attempt to trick users into visiting potentially harmful sites. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure strongly indicate a malicious intent to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/get-roblox-items-free-crome-addon-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-no-survey-no-download-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/download-roblox-free-on-the-apple-store_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/earn-free-roblox-gift-cards-legits_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-roblox-money_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_off0000514b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x514B 24960 bytes
SHA-256: e30c64af3215b687e2d84e993af07924bcca82cd9269cac63b5f5174cacb66ef
font_01_sfnt_off00008b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B27 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000094d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D8 18488 bytes
SHA-256: 2ea52ea2aa1ee63e2f60b69afec23175e254935991f3555337425ed8c2524699

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