Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ea907c3196f83c…

MALICIOUS

PDF

41.2 KB Created: 2021-05-13 12:31:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e545878e96831f8f421500644a2f520a SHA-1: 90985a321aeaec7146572a25ccfeea9a799cabca SHA-256: 55ea907c3196f83c37aa3f2b956075fba387a6785beaea82ccc717d263d27f3f
182 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 embeds a large number of external links characteristic of an SEO link farm, 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 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/coin-master-free-cards-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/406889139/coin-master-free-cards-game-hack PDF link annotation
    • http://akvamaster.com.ua/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://akvamaster.com.ua/images/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/coin-master-free-gold-cards_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://akvamaster.com.ua/images/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/get-me-robux_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/free-robux-com_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/free-ways-to-get-robux_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_003_off0000490d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x490D 24148 bytes
SHA-256: 00efb51b7926ba028b6be5719abca2d2cc5450a687a720812f363695f6a9f980
font_01_sfnt_off00007ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF2 17884 bytes
SHA-256: dce98ab1a9f6331dfaabbdd57dacdba92c66b57249d10e9c2a1df39138c2a47b

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