Malicious PDF — malware analysis report

Static analysis result for SHA-256 382b2019591dd813…

MALICIOUS

PDF

42.3 KB Created: 2021-05-12 07:00:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dc3231fb6378d634cbef1b8f71b103e5 SHA-1: a92ebcb28816388d4f59e3f6e239a947d8ad76db SHA-256: 382b2019591dd813051bf723bc8992e17e4f9ac25d924811b6f3cdfecb467ef4
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 0.9971

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.xyz/app/431946152/how-to-get-free-robux-without-verification-or-surveys-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.xyz/app/431946152/how-to-get-free-robux-without-verification-or-surveys-game-hack PDF link annotation
    • http://repository.ummy.ac.id//repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/robuxhub-net_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/cone-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/real-robux-generator_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47A8 24312 bytes
SHA-256: 1b9dfa1a3839097a8a2ff04eb9083b989038d6d1bc4c422ad59316a432cc8608
font_01_sfnt_off00007f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9C 19424 bytes
SHA-256: 30551668946d9b3d80fdd5a427c07e5f2c52faec585ae3c44dbbbd4d67cc7463

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