Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8851010cd806808…

MALICIOUS

PDF

46.4 KB Created: 2021-06-11 11:55:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 27fa5ce9326065addc16809a3dd34874 SHA-1: de531068ec1d45926eb9e1fc4132b77893ec2df7 SHA-256: e8851010cd80680887ca62ab893e24ca5d2025504a7c37b1168e773675d3fe2c
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 0.9748

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/free-roblox-app-for-android-game-hack PDF link annotation
    • https://library.sttbandung.ac.id/repository/free-radio-obby-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-anti-cheat-speed_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-face-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/is-pokemon-go-free-on-ios_GM1094591345.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-on-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f41.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F41 24832 bytes
SHA-256: f8030b29ce51a34be0efa469719503dc2c721a0526381b597a4a055666136459
font_01_sfnt_off00008862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8862 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off000091fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91FD 18420 bytes
SHA-256: 800d26abe81a84ba836d85ee9d9c9d7efddad8e3066077b8d41c29a4aba1ab56

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