Malicious PDF — malware analysis report

Static analysis result for SHA-256 88508a1c13b916a7…

MALICIOUS

PDF

46.0 KB Created: 2021-06-11 11:03:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6700b88809c4d542b0d921ebdb0d4b4f SHA-1: 22331d19cef74776d89d0a50493d78152af92537 SHA-256: 88508a1c13b916a79869ce5ad24a21f11dd8b4426898f2569e4c7d1a78277138
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing and 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 0.9864

Heuristics 6

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/free-robux-with-gift-card-game-hack.
  • 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-robux-with-gift-card-game-hack PDF link annotation
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/mad-city-roblox-hack-pain_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/do-you-get-banned-for-hacking-in-vip-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/dailyrobux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-javascript_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/https-mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-roblox-codes-live_GM431946152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005226.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5226 26028 bytes
SHA-256: 9cc9f27ac78661d863e726524d2d9b9bbc7d12952120011436c3cc11ce6f6e17
font_01_sfnt_off00008efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFE 19004 bytes
SHA-256: e15412c2b0572e966ea3083cc63bdc3020dfde422509b7d4421094aaea312a8f

Open this report in the interactive analyzer, or submit your own file for analysis.