Malicious PDF — malware analysis report

Static analysis result for SHA-256 54171afd9219baef…

MALICIOUS

PDF

46.5 KB Created: 2021-05-18 03:35:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 44d5bc6ff3fc909ec68d38f301ba1c68 SHA-1: 7b0501523a469e4a1a13c88b42ee38450b53b471 SHA-256: 54171afd9219baef16baf7940059eeaf3fce48320bf7a6a26d6328c949eee67d
122 Risk Score

Malware Insights

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

This PDF document contains a lure for a 'free generator / game hack' that impersonates Microsoft, directing users to a suspicious URL. The presence of external URIs and a brand impersonation credential phishing lure indicates a likely attempt to trick users into providing sensitive information or downloading further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/roblox-cheat-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/roblox-cheat-game-hack PDF link annotation
    • http://ukrainiansofbuffalo.com/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/how-to-get-real-robux_GM431946152.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://ukrainiansofbuffalo.com/images/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004910.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4910 24980 bytes
SHA-256: f72c49503989875f3cfd2784d3b0cd17bd6979e1319a41cecdf1dde111b2d3a9
font_01_sfnt_off000082db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82DB 6768 bytes
SHA-256: fa93de321190668b294ff46149e4b98ac349b4fd022dcee9ecd964f7f59f3f9a
font_02_sfnt_off00009319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9319 18280 bytes
SHA-256: 98eeb43752f52f60f387912f8d519d04d2eb9110f2a162fc7878abe7cd109578

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