Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e748859cc10824d…

MALICIOUS

PDF

46.9 KB Created: 2021-06-09 16:30:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9cfcccf220661f9dc34e149ea74c1a02 SHA-1: 153de78529669e3d1857035f2266dc2018be7ab6 SHA-256: 4e748859cc10824d298d8accdf375061c9818a7126b018ee06f9e4bfada92f92
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/running-free-robux-game-hack PDF link annotation
    • http://katalog.stikesmukla.ac.id/repository/tiktok-free-code_GM835599320.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/robux-win_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-hack-init-roblox-hack-addrobux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-make-hacks-with-studio-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/real-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-robux-games-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-free-spins-youthnow_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
font_00_sfnt_off00004cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD3 27284 bytes
SHA-256: b4c90c2816383c4fc43a216ab81c82231bb0555ea209ab2227f085251e03a7c8
font_01_sfnt_off00008a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7D 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off00009417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9417 18420 bytes
SHA-256: 144f91413aa904a6a1612f6207b3c4ebaeb6d4d1d0c37464a16d283ef3ca69a8

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