Malicious PDF — malware analysis report

Static analysis result for SHA-256 438f458ffe715abd…

MALICIOUS

PDF

48.7 KB Created: 2021-06-03 08:52:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d2ea7d1779a2ca0298eab43a344e6efd SHA-1: 362b436ea74134d03efb2fc79f9a566d093bce92 SHA-256: 438f458ffe715abd43e425c39c90d2347e19d162a8c7b6d04864f0fcdcce13f6
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9796

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.
  • 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.online/app/431946152/free-robux-please-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.online/app/431946152/free-robux-please-game-hack PDF link annotation
    • https://elibrary.ikhac.ac.id/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/toolbox-mod_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-minecraft-education-edition_GM479516143.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_off000050d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D0 24788 bytes
SHA-256: fa26b5b48c8fdf6d3a916468eed9b077c25877e913df85e3d8e34f1b28da92d5
font_01_sfnt_off00008950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8950 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_02_sfnt_off00009b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B33 18472 bytes
SHA-256: a4143b220e35e332e52efa777ecf598d1a164c1d6c5ab1887881bf2674d2e637

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