Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a32eed5066d7b3…

MALICIOUS

PDF

46.3 KB Created: 2021-06-10 14:06:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 83ad697dc8b942b0e9c99982c12b23b0 SHA-1: b483ff269a421976f5abefbc163f3a8a1ff19820 SHA-256: 27a32eed5066d7b376bc45877ae9a46c4c38a6fd4e00544f5e3251cfc5bd1baf
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 0.9832

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 https://netcdn.tw/app/431946152/how-to-get-free-robux-without-human-verification-on-computer-game-hack PDF link annotation
    • https://edu.kyst.com.tw/image/data/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/mathep_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/pubg-uc-hilesi_GM1330123889.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/mcpe-com_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/pubg-uc-recharge_GM1330123889.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-download_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-no-email_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_off00005358.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5358 25664 bytes
SHA-256: 99d525e04db76fa5b2109da9e0088957ace65457a32b53b77776b63f1c828ff7
font_01_sfnt_off00008e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E99 19564 bytes
SHA-256: dfde580aad5e78ce6686e4f54d3ade8352b389478c80426cab4ec2f6456be8bb

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