Malicious PDF — malware analysis report

Static analysis result for SHA-256 f040e1b532efce77…

MALICIOUS

PDF

49.4 KB Created: 2021-06-07 18:31:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9a4b90384046718c9101715bb8c1d696 SHA-1: d4ac074496e89bb28b786661be238ff627032bf2 SHA-256: f040e1b532efce77be2cbdcaf91ec207cdbb745af28b8f3908c23be55ba9d2b4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF document impersonates Microsoft to lure users with promises of free Robux or Minecraft downloads, directing them to a malicious URL. The embedded URL and the document's content strongly suggest a credential phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs and brand impersonation indicates a likely attempt to exploit users through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 4

  • 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.tw/app/431946152/how-to-hack-and-steal-pepole.
  • 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-hack-and-steal-pepole PDF link annotation
    • https://www.tiancom.com.tw/upload/files/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-spin_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/static-moonactive-net_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-2all-win-hack_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-earn-robux-fast_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_off000050a9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A9 32776 bytes
SHA-256: 01b992a4032cc33631082a91816d1cb6307a98a9c3294f5b48a39dd733a378c9
font_01_sfnt_off00009ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB2 19560 bytes
SHA-256: a8d6fd40bb6294252918a20f767cfb90ffd16cb34d98ab26d2a4d8eb9ce3ac92

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