Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c9aa306870c923…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 08:02:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ffc994a7da04a3c0b6232b8a2d1e8a8b SHA-1: 80887fb5468dc5d41bbab3b0cffd0f6c2f01ec12 SHA-256: e2c9aa306870c923eb44833a0a9e5aea8053b16b762f3b5e85723a6eb4c19829
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 0.9865

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/roblox-rape-hack-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/roblox-rape-hack-game-hack PDF link annotation
    • http://samavetpharm.com/userfiles/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/robux-gratis_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/pubg-uc-exchange_GM1330123889.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-coins-coin-master-2021_GM406889139.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_off00004fe6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE6 26888 bytes
SHA-256: a29ad2bd79dd8e16d4b9a6083a05b32688ff86a730eea1840b63fd5169fde531
font_01_sfnt_off00008d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0B 18356 bytes
SHA-256: 8a1fe0c7231104fca4fa627868bae52978e90e92fc8d209bfe3611444447d27b

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