Malicious PDF — malware analysis report

Static analysis result for SHA-256 92389cae43c20554…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 06:37:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b742d09c19cf9c7fbadc243aa8f7b46e SHA-1: 380e7f52992a1e8c44a8d8ae96bc73403cf72fcc SHA-256: 92389cae43c205546e4a2b8daee76bffb7e2a31f5b86eb2fb7e910f4103db687
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 0.9864

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-free-item-codes-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-free-item-codes-game-hack PDF link annotation
    • https://dolphintour.vn/images/uploadsfiles/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/best-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-weird_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/robux-free-c_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/114-hacks_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-roblox-toys_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-download_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/pubg-uc-daraz-bd_GM1330123889.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.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_off000051d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D2 26700 bytes
SHA-256: de38ace79f0aa7d3fdfa870c63589380ba8ab97df56877b0a0f9153f132294b5
font_01_sfnt_off00009068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9068 18488 bytes
SHA-256: c72c233e0477db5c15587e2c1e6f96ab3255d21c2f787dab6c27132f5893b73f

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