Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da93aeba50c0f6b…

MALICIOUS

PDF

49.4 KB Created: 2021-06-10 21:30:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dc98d82137364b3195ae98f69bf1e3c1 SHA-1: 8a3268625728a29f85ad5a12e93314cb71fbe9c6 SHA-256: 2da93aeba50c0f6ba8aa27a584d415d29692ec6136530e3a9e70c447c0fde09b
200 Risk Score

Malware Insights

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

This PDF document employs a lure for 'Free Robux' and displays a fake CAPTCHA to deceive users into interacting with malicious links. The primary link, https://netcdn.tw/app/431946152/free-robux-2021-youtube-game-hack, is identified as a malicious redirector. The document's structure and embedded links suggest an attempt to exploit user interest in gaming-related cheats to initiate a download or redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-robux-2021-youtube-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/zyrus-12-roblox-hack-exploit_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/cheat-engine-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-radio-obby-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/cheats-fr-roblox-madcyty_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-free-shirts-and-pants-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/any-gampepass-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-golden-card-hack_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_004_off0000528b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x528B 27656 bytes
SHA-256: ea170bfb312087c151499d778412b4c70beabd8d1efc44323198e52f8f5fb30f
font_01_sfnt_off00009035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9035 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D46 18684 bytes
SHA-256: 06336d5ebd6e0c8be32ef05117213575603456d8aa1d687b77b5c9bcf66d8b41

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