Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee05b06f6ff280d…

MALICIOUS

PDF

250.9 KB Created: 2021-07-03 21:30:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 034444dee8a700e6ff59e323081dcedb SHA-1: 253104decbd8f565899605e59ba320de7c6e39a0 SHA-256: 1ee05b06f6ff280d69216ba26c7c1ed999379ab59dd288ff4ee70ca6969a1382
180 Risk Score

Malware Insights

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

The PDF document contains multiple lures, including a fake CAPTCHA and a 'free generator / game hack' offer, impersonating Apple to trick users. The primary IOC is the malicious URL http://netcdn.tw/app/1330123889/pubg-uc-vn-game-hack, which is likely used to deliver a second-stage payload or harvest credentials. The document body is heavily obfuscated, preventing a detailed analysis of its specific scripting behavior.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 8

  • 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.
  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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: http://netcdn.tw/app/1330123889/pubg-uc-vn-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/1330123889/pubg-uc-vn-game-hack PDF link annotation
    • http://www.myresidence.lu/userfiles/files/how-to-get-free-robux-2021-on-phone_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/can-you-get-free-robux-on-your-birthday_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-hack-power-training-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/funny-roblox-hacker-names_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-hack-roblox-treasure-hunt-simulator_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/working-hacks-for-getting-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-rbx-place_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-do-u-get-free-robux_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_024_off00037f08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37F08 26180 bytes
SHA-256: fc7ba82d926f544692c5e84896023156c077610baebde609ee8f50103e087d10
font_01_sfnt_off0003bc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BC71 18260 bytes
SHA-256: dc4e3219e286ca2b3412dfa4a1d40ce320a7cfce8433dad6ed8c469fe9e4131b

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