Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5cb124c3fc7f26…

MALICIOUS

PDF

250.7 KB Created: 2021-07-05 07:05:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2b552d3ecc973b9fdd9fd8cb948b8174 SHA-1: 4a23a26ee0f155d0f6e52e42c234c56e990ece50 SHA-256: 1d5cb124c3fc7f26c42a42c85fc0dea5a95a469e66e9375abf90ad9f1e1b45a9
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1534 Steal Session Token

The PDF document uses a combination of lures, including a fake CAPTCHA and MFA prompt, to trick the user into clicking a link. The link, http://netcdn.tw/app/1330123889/pubg-uc-details-game-hack, leads to a website offering game hacks, which is a common lure for credential harvesting or malware delivery. The document impersonates the brand 'Apple' while directing users to a non-Apple host, indicating a phishing attempt.

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-details-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-details-game-hack PDF link annotation
    • https://razredna-nastava.net/files/how-to-hack-usernames-and-passwords-on-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/infinite-jump-hack-for-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-2021-robux-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-net_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-roblox-pin-codes_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-script-to-hack-into-an-accont_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-the-er-face-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-pajamas-free-shipping_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/robux-games_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_off00037dc3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37DC3 25928 bytes
SHA-256: 3bddda177d04aafefcaddad2be3747d082eeadb63f707d8f06243de49b55523e
font_01_sfnt_off0003badf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BADF 18592 bytes
SHA-256: 3b8e20fd862589eaa84a85ba1f1e8a17c93fb5eb4745c86547c9c5d25b3b615b

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