Malicious PDF — malware analysis report

Static analysis result for SHA-256 533e1e5c15b2a17a…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 11:53:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e965183fcb2d028fbec30a90d77288bd SHA-1: dd5623eaeabe4b38129b3370cc75b3306fc27dd2 SHA-256: 533e1e5c15b2a17af414b73c652a59111fdcda56b1d20e736d2f23115b0f5ad5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as a 'free generator / game hack'. The document body and embedded links promote lures for game cheats and free items, aiming to entice users to click through to the malicious infrastructure. The primary malicious URL identified is http://netcdn.tw/app/406889139/how-to-get-free-spins-on-coin-master-ios-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/how-to-get-free-spins-on-coin-master-ios-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/hack-roblox-download-and-install_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-admin-hack-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-scar-h-free-in-phantom-forces-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/are-there-and-free-safe-roblox-exploits-v3rmillion_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/cipherv3-roblox-exploit-rocky-hacks-and-more_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-account-giveaway-may-7th-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-how-to-hack-gravity-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-download-2021-pc_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/pubg-uc-olx_GM1330123889.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-you-own-roblox-card-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-robux-hack-generator_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_off000032e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E0 22688 bytes
SHA-256: e473d50849cbec0f89e50c9f79e9c9e09122abb15cd8ba7dc669c6b312d427cc
font_01_sfnt_off00006587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6587 18336 bytes
SHA-256: 8feb4de5e0b81dfb5bdd45a4e83ab8cdf26242fb4b01d276e6d24fc13f5d61a8

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