Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da4a6cd7361fdfa…

MALICIOUS

PDF

44.6 KB Created: 2021-05-14 01:06:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 667b0ad653f3e33a7efc117f4c10344f SHA-1: 13ea28d80775ac6c2544ca5e69c27612a9525390 SHA-256: 4da4a6cd7361fdfa2cd5394154f2676d252bae202c8f6ec1d17a82020cb6bc4a
242 Risk Score

Malware Insights

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

This PDF document employs a lure related to obtaining free games, specifically Minecraft, and impersonates the brand Apple to encourage clicks on malicious links. The document contains a high density of external links, many pointing to domains associated with SEO link farms, suggesting a campaign to drive traffic to potentially malicious or phishing sites. The presence of a 'download button' lure and a remote support tool lure further indicates a high-risk social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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: https://netcdn.xyz/app/479516143/how-to-get-minecraft-bedrock-edition-on-pc-for-free-game-hack.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.xyz/app/479516143/how-to-get-minecraft-bedrock-edition-on-pc-for-free-game-hack PDF link annotation
    • https://tnupacktour.com.tw/image/data/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-today_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-roblox-templates_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/a-lot-of-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
font_00_sfnt_off00005038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5038 26796 bytes
SHA-256: c830d97c7ea8ce953c2355de62f3e9047f8a7a59676e5ec6d90a40a49dd9bc3f
font_01_sfnt_off00008b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B88 18588 bytes
SHA-256: 22ac8c3ecfb52a55793ff71594f7fcfb36c91cb725e140eddc746c1d049752ce