Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70876948a288fcc…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 13:21:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d9e0992d5a8618b37af8d82bea31378e SHA-1: 2d458743696a0e2fcd341db2bbe75b18a31a358b SHA-256: e70876948a288fccefa232ec686ac075ee08c2b4e10c1cc38ddac75137f61659
122 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'free Robux' and impersonates Microsoft, directing users to a suspicious URL. This strongly suggests a credential phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • 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.online/app/431946152/robux-free-robux-game-hack.
  • 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.online/app/431946152/robux-free-robux-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/code-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/install-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-gift-cards_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_off000051bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51BC 24088 bytes
SHA-256: 1c41fe277cb548a895f1d0da31b28a68381d5170e7d96097e986bebca6d2fb72
font_01_sfnt_off000088f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F1 18012 bytes
SHA-256: 3f1ded8a9c51e4f0f41c660fd84d3573ebe8f92a83837bcaa523a9614d650e73

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