Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dbd40631956ad9…

MALICIOUS

PDF

48.9 KB Created: 2021-06-04 01:31:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d037abcc0711cfe4df5c67815f7cefda SHA-1: e88a54e348c24091aa27f1f125b89447423464f4 SHA-256: d5dbd40631956ad9c4451863653ef518452b5205257d99b3bb9b011b2471e162
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The ML classifier also strongly flagged this PDF as malicious. The primary malicious activity observed is the redirection to external URLs, likely to deliver a second-stage payload or phish for credentials.

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-app-real-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-roblox-on-macbook-pro_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-free-pants_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_off00005471.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5471 25772 bytes
SHA-256: c1e7df2f7b458cd7a18fa199e98c732759d2db2a39ae5992b3a9a182d2097673
font_01_sfnt_off00008f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F29 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD1 18492 bytes
SHA-256: 9e447b6d8b47d61e54db9515b6598511f2c2f765926adb3e35dae1cd8ee44e1f

Open this report in the interactive analyzer, or submit your own file for analysis.