Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe78e3f07184473…

MALICIOUS

PDF

45.8 KB Created: 2021-05-13 11:32:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 21cb65644d1700188b4f6338eb018aac SHA-1: 2f7d30d1a380916ac9fd45c6d7eea854737876c1 SHA-256: ffe78e3f07184473805b939c3f638ad679328862ab00aff6c5cfa06c3393a4ed
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to redirector infrastructure, masquerading as free game hacks and generators. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of a lure for clipboard command execution suggest the document is designed to trick users into visiting malicious sites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.xyz/app/479516143/minecraft-free-download-linux-game-hack In PDF document text
    • https://ethraa.ae/userfiles/files/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/real-robux-generator_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/minecraft-apk-download-free-11-055_GM479516143.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_003_off00004a9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A9F 25676 bytes
SHA-256: 9d7774cf727ea06236d411ab4ff5d48bccc6f0dd54b3d67273c85239d5d4b2e2
font_01_sfnt_off0000859d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x859D 2856 bytes
SHA-256: 8c5d9bcb386d88c7f99323d8d482e46ea21dea038a5b842744dd5d39b26b2c44
font_02_sfnt_off00008f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F73 18640 bytes
SHA-256: 2e09412aeccd6db579e17e260dc71f26a69ff1e6c71cb2a54a0bf8e01b9e41c1

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