Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f71585bb9611225…

MALICIOUS

PDF

43.4 KB Created: 2021-05-19 00:39:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 77d3ac2ed85cd37734f4efc012b8a4a2 SHA-1: 202cd6e81c9afb93d45441333f76a35c0cd11fd7 SHA-256: 4f71585bb9611225140016868d6bc8e5025db28e09e8ce6a8a968fc0096daba4
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA or human verification lure to trick users into clicking malicious links, disguised as game hacks or free item generators. The primary malicious link identified is https://netcdn.xyz/app/835599320/tiktok-get-free-followers-game-hack, which is part of a chain of redirectors. The document's structure and embedded links suggest an attempt to exploit user interest in online games and social media for malicious purposes, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/835599320/tiktok-get-free-followers-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-app-2021_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
stream_003_off000047d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47D2 24004 bytes
SHA-256: 93d95fc573eb907ed3e0af1bcdf016c7cc1981b6526427d1c8c180d986773873
font_01_sfnt_off00007e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8D 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off0000889d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x889D 17692 bytes
SHA-256: 3e938a2d5d2718dc6f8736a940f23f06ece176f5b2fe7edc306dd5bc633b75a7

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