Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5d6baaf648304b…

MALICIOUS

PDF

42.6 KB Created: 2021-05-11 20:03:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 63309c135bbc9a41fce4ce7cc6a7002b SHA-1: d19a52e7196dd26ce070662999061654c5261dbf SHA-256: fb5d6baaf648304b6889d6b9b951c52539786af0359c5c885cb864e451fe7a3d
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/how-to-get-free-roblox-premium-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.xyz/app/431946152/how-to-get-free-roblox-premium-game-hack PDF link annotation
    • http://mou16-murmansk.ru/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/rewardex-robux_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000498a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x498A 25068 bytes
SHA-256: c53763bfe337b3d5808a2930979abd81646bf06b280944891e6119fe77075c25
font_01_sfnt_off000082b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B4 18888 bytes
SHA-256: 3ba61bc9b3b11ac9a9f3633ee28239b24940f03e179bf58c89719787cf1740e7

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