Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea93f1e825c9f72f…

MALICIOUS

PDF

46.1 KB Created: 2021-05-12 03:06:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8f2131daa9e883830954329c613a5d22 SHA-1: 7b49f8e816e31f7752945323490771dfb69f802c SHA-256: ea93f1e825c9f72fb42b12d16f4197d609b2239d28c636a87353a6e6c475822d
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking a malicious link. The link, https://netcdn.xyz/app/479516143/minecraft-for-chromebook-free-game-hack, is associated with known malicious redirector infrastructure. The document's content and embedded link suggest an attempt to deliver a second-stage payload or redirect the user to a phishing or scam site.

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-for-chromebook-free-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/toolbox-mod_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-live_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/getrobux-now_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-master_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/real-free-robux-generator_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_003_off00004e08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E08 26176 bytes
SHA-256: 9baee3cc5fedf35c33399de024dd6f0be1a1fc1b3e1741bf596660c829d127f9
font_01_sfnt_off0000876d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x876D 2892 bytes
SHA-256: c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4
font_02_sfnt_off00009156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9156 18464 bytes
SHA-256: 2a1fd25b60091da4e89f293bc06fa32417487358dc39e20cf321c71e22d0bfdc

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