Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e8a22952d1db68…

MALICIOUS

PDF

46.1 KB Created: 2021-06-09 11:19:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f38e9e628514753469c180f22bdfd513 SHA-1: daf35c0ff92fb00cd2b87f2f90ab199f3db2c468 SHA-256: 78e8a22952d1db689ea15950c2a6d8430ad90425ea8888c69fc44a49bb5cfa10
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document displays a fake CAPTCHA or human verification prompt to trick the user into clicking a link. This link, 'https://netcdn.tw/app/431946152/roblox-cheat-engine-table-08-2021-game-hack', likely leads to the download of a second-stage payload. The document's content and embedded URLs suggest a lure related to game cheats or free in-game currency.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-cheat-engine-table-08-2021-game-hack PDF link annotation
    • https://healthcare.kyst.com.tw/image/data/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/pokemon-go-free-spoofing_GM1094591345.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/dragon-ball-rage-roblox-hack_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/classic-minecraft-net-hacks_GM479516143.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_off0000530f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x530F 25552 bytes
SHA-256: 2eabb9d6f5e7e78564cf6e9e12518dcfdd81a27a5ce979e20c80ad1f0554145f
font_01_sfnt_off00008e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9F 19300 bytes
SHA-256: 1a864fd55765abed21d182a156b49bdb9ec3fef9eb476a1e82d52ed947f1d1d2

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