Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5df5972a3fdf64…

MALICIOUS

PDF

47.9 KB Created: 2021-06-04 01:39:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5f0e081d10c4d9bb8fe66169782bba01 SHA-1: 0d8bd78ed0ff8655f71db22ae416dcf8368e5d85 SHA-256: 3b5df5972a3fdf64af2d4ad2b4b314afc4e2aac8aa467bdc27f94cc9b57062d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "free Robux" or "game hacks" as a lure. The presence of a visual download button and the ML classifier flagging further support its malicious nature. While no scripts were explicitly extracted, the embedded URLs and the nature of the lure strongly suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

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.online/app/431946152/free-robux-hack-no-human-verification-game-hack In PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-robux-on-roblox-no-hacks_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-levels_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-easy_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_off0000535a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x535A 24832 bytes
SHA-256: 2c18442558b16200040bd7fb88fab717c2373c886b4d120a3e01d28906b3dafe
font_01_sfnt_off00008c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C9E 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off0000964e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x964E 19028 bytes
SHA-256: 768a4e91d7c3975acc2b79a699acb909e0f8bbf2befa87684aa1b4f9aecc197e

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