Malicious PDF — malware analysis report

Static analysis result for SHA-256 3121d311c2415e0c…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 12:39:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 53b32fbcdf30b250633376861e38942a SHA-1: aa0d1de36b149fd765bbfede75c5f4a0e798d063 SHA-256: 3121d311c2415e0cca0f3e29706383319f12a23a665abbd359aacf4970c0af02
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-apk-hack-mod-download-game-hack PDF link annotation
    • https://ktphuhung.com/public/upload/files/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/get-more-robux_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/roblox-free-gift-card-codes-unused_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/roblox-wipeout-beta-hack_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/in-game-money-hack-roblox_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/roblox-how-to-use-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/apk-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/pubg-uc-add_GM1330123889.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/wild-and-free-id-roblox-code_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://ktphuhung.com/public/upload/files/hacks-para-roblox-2021-booga-booga_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
font_00_sfnt_off00003201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3201 23196 bytes
SHA-256: 82de22a18650d3bc9194d1073e5e612e1829c542c438d94f87028a83cadaa6f6
font_01_sfnt_off0000663a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663A 18760 bytes
SHA-256: ec7a458fe2bbad6ce9ec209de50d05d0206296983a0e5c16239db9a9d5dfea1c