Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9743de31d174eae…

MALICIOUS

PDF

45.1 KB Created: 2021-06-09 04:13:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 882ff282aa973e29ede0935163657c41 SHA-1: da04d5c34525f0334bd34e707783c0b13c0a3f0f SHA-256: f9743de31d174eae8be3933eeb8f874f5b9f00972915ea15c867b70c300144a5
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 0.9865

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.tw/app/431946152/play-roblox-com-free-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/play-roblox-com-free-game-hack PDF link annotation
    • https://library.stikeswnpalu.ac.id/repository/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-cards_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-tips_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/what-do-points-do-in-roblox_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_004_off000050e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E9 26024 bytes
SHA-256: 98a139061a2e9212473a697a1b3ef28b7fbc5a42feaf1349005cfe5b4013853a
font_01_sfnt_off00008c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4F 18768 bytes
SHA-256: 11d6bd1eb8455997a155ae1984379ef999dd3c3ad47b798d529bbb2a506db9d7

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