Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71882130cce9ee7…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 05:27:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f7107f2ec24d29c033c1bed9d468e873 SHA-1: d51feabf4fa292bb0c0426c8fbfe28196ed889a5 SHA-256: c71882130cce9ee74467b9c32f501542c868131eb90d585d54177bbe34c7d514
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'Coin Master Hack' and similar game-related lures. The document body, though partially corrupted, contains a URL pointing to a malicious redirector, reinforcing the phishing attempt. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/406889139/coin-master-hack-no-download-game-hack In PDF document text
    • http://perpus.i2s-learning.com/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/pubg-uc_GM1330123889.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/master-coins-free_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/get-me-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spins-link-no-verification_GM406889139.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_off00004de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE7 24432 bytes
SHA-256: 5496b5162a3ba056c3bcab3e13908d6a4feeffe5d62c351a60e0cf26651c7a14
font_01_sfnt_off00008555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8555 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00008f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F08 18296 bytes
SHA-256: b5e07150b2161f53c53a5a0ecf5e7f42140b65a1732b8c9e08245fa4e84c8ce4

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