Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5d25a29972bb9d…

MALICIOUS

PDF

35.0 KB Created: 2021-06-26 03:50:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d97849aa5073f0148d84af2a0ef9cdbf SHA-1: 5dc5fcdb3b6305f5c29cc2f2dc4ec238397f61f8 SHA-256: ef5d25a29972bb9dc5038b27447250ac980ac32308ed7c9f0448331612fddc95
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and domains associated with game hacks and free in-game currency lures. It also includes heuristics indicating a password-protected archive lure, suggesting a multi-stage attack. The document body itself contains obfuscated text and URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.co/app/431946152/roblox-hack-2021-game-hack In PDF document text
    • http://library.acehresearch.org/repository/gainbux-gain-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-how-to-get-free-robux-promo-code_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-best-exploit-cheat-ever_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-cheat-engine-game-shut-down_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/get-any-roblox-item-for-free-new-2021-working-legit_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-human-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-robuxian_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-ss-executor-free-v3rmillion_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3352 22028 bytes
SHA-256: aed29145863b4b38a0c554d42ad63145be2d464847fe814f53bd57a3fc102fd4
font_01_sfnt_off000063bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BC 19056 bytes
SHA-256: 98be41374c31724b7a878275a9dc475d7e9908887f4f5935c763b7161266aa61

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